hawk shell slide-in/aluminum flatbed: hybrid buildout

ri-f

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Jan 6, 2021
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Pacific Northwest
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Hybrid buildout: minimal FWC Hawk shell slide-in model and aluminum CM flatbed, sitting on a 2001 Cummins 2500 turbo-diesel platform. There are a few photos, some basic details about the rig, some of our systems modifications, and initial thoughts about performance over the last year based upon a few of our shakedown runs.

https://ian-frese-offroad-camper.blogspot.com/
 
Dessmo said:
Nice rig:) Seems like you have thought well through the details building this rig.
Thanks for that, Dessmo. Yes, the devil is definitively in the details. Tricky part is finding the balance between thinking something through and taking a chance on it, or overthinking it and getting stuck..

Rich
 
Machinebuilder said:
NIce, similar to my plan.

I've got a 2021 F350 coming and want to put my Granby on a flatbed.

Are you satisfied with the CM bed?
Thanks, Machinebuilder. I looked at a lot of truck bed manufacturers and thought about custom building one, and in the end settled on the aluminum CM for a few reasons. They are an excellent build; the construction is both lightweight aluminum and reinforced with steel in the critical spots where it attaches to the truck's steel frame. There's a lot of attention to detail, and TIG welding is remarkable for a mass-produced flatbed. The deck paneling I went with was a rugged, reinforced, ribbed aluminum vs wood slat.They have a good selection of models and configurations, and you are bound to find one that will fit your new F350 as if it was an OEM design. You can trick it out any way you want. There's a lot of flexibility.

I kept to the bare bones basics when buying the flatbed and fabricated my own aluminum side rails and boxes, both to keep the costs down, and to work as I had intended. The boxes that you can typically buy, as add-ons, are extremely expensive and wouldn't have worked as well for what I had in mind, so I could save some money there by configuring and building out my own. Since I was building a hybrid, that is, a Hawk slide-in shell vs Hawk flatbed model, onto an aluminum flatbed, I could take advantage of the valuable space on the outside of the shell, on the sides, that on a pickup body simply goes to waste. You can have a lot more exterior space with a flatbed with side rails/flip down gates, in the same foot print as a pickup. The prices of a CM depends on the flatbed model you want. Relatively speaking, it will probably run you about half the cost of a Norweld, which are very nice, but much more expensive, and no better built. And for my purposes the CM was better suited to the build I had in mind, anyway. There are other manufacturers who are also competitive with CM's prices and quality of build, for instance, Bradford Built, and others like ProTech who are semi custom and more expensive than CM but less expensive than Norweld. But in the end, there was a CM distributor, local to where I live, and so it was convenient for me to run over there and see what they had in stock, in their yard, and to sort out in person, what I had in mind. I liked what I saw when I got there and decided to go with a CM.

A basic CM model, like what I put on - the AL RD Aluminum Flat Deck Body - will probably cost around $4K+. You can find new aluminum flatbeds for $3K or perhaps even less, but at that price point I'd be a little concerned about the build quality, fit, or dodgy construction. Hope that helps.

Rich
 
Rich

Thank you for your detailed response.

I've been dreaming of this since before I got my FWC.

I saw one at an Overland Expo that use tool boxes and really liked the Idea.
When I saw the Sherptech beds I liked the idea of the fold down sides.
I haven't been to the CM dealer near me, I don't think they stock anything. so it great to here the feedback on them.
I like the aluminum plank floor better than a diamond plate most use,

I would like an under bed box on both sides and will now think about the fold down sides.

I'm getting the pickup bed so I am not in a rush.

I like the way you did the inside with the 2 floor chairs, I have the rollover couch, and moved it to across the front, but I don't find it comfortable to sit on.

Dave
 
ri-f said:
Thanks for that, Dessmo. Yes, the devil is definitively in the details. Tricky part is finding the balance between thinking something through and taking a chance on it, or overthinking it and getting stuck..

Rich
Well said. That is the black hole a lot of people seem to fall into. Especially over at Expedition Portal.

I really like your rig. It is capable and well equipped while being very simple.
 
Machinebuilder said:
Rich

Thank you for your detailed response.

I've been dreaming of this since before I got my FWC.

I saw one at an Overland Expo that use tool boxes and really liked the Idea.
When I saw the Sherptech beds I liked the idea of the fold down sides.
I haven't been to the CM dealer near me, I don't think they stock anything. so it great to here the feedback on them.
I like the aluminum plank floor better than a diamond plate most use,

I would like an under bed box on both sides and will now think about the fold down sides.

I'm getting the pickup bed so I am not in a rush.

I like the way you did the inside with the 2 floor chairs, I have the rollover couch, and moved it to across the front, but I don't find it comfortable to sit on.

Dave
Dave,
The CM deck consists of series of tongue and groove, ribbed aluminum panels. The are really nice. Waterproof, corrosion resistant.I laid a thin but heavy-duty piece of standard truck-bed rubber matting down, on the deck, to prevent the camper from slipping or vibrating. It provides some cushioning, protects the deck (not that it needs protecting) and works very well. Probably a good idea when you eventually get your flatbed.

The two seats, inside, are made by Sport-A-Seat. I originally used them on a cruising boat, in the cockpit. So they hold up to salt spray, UV, and anything else an outdoor, marine environment can throw at it. They are also very comfortable, even on a hard teak deck. So I thought they would practical in the camper. Inside a camper they can fold flat and stow easily and take up very little space. There are copies of this seat that are sold at big box stores that are cheaply made and cost a bit less, but they really don't compare at all in quality or comfort.

Rich
 
Kolockum said:
Well said. That is the black hole a lot of people seem to fall into. Especially over at Expedition Portal.

I really like your rig. It is capable and well equipped while being very simple.
Thanks, Kolockum. I like your signature about the nut behind the wheel being the most important one. Don'r forget to snug yourself up every once in a while.

Rich
 
ri-f said:
Thanks, Kolockum. I like your signature about the nut behind the wheel being the most important one. Don'r forget to snug yourself up every once in a while.

Rich
Thanks. I am adding the second part to my signature.
 
ri-f said:
Dave,
The CM deck consists of series of tongue and groove, ribbed aluminum panels. The are really nice. Waterproof, corrosion resistant.I laid a thin but heavy-duty piece of standard truck-bed rubber matting down, on the deck, to prevent the camper from slipping or vibrating. It provides some cushioning, protects the deck (not that it needs protecting) and works very well. Probably a good idea when you eventually get your flatbed.

The two seats, inside, are made by Sport-A-Seat. I originally used them on a cruising boat, in the cockpit. So they hold up to salt spray, UV, and anything else an outdoor, marine environment can throw at it. They are also very comfortable, even on a hard teak deck. So I thought they would practical in the camper. Inside a camper they can fold flat and stow easily and take up very little space. There are copies of this seat that are sold at big box stores that are cheaply made and cost a bit less, but they really don't compare at all in quality or comfort.

Rich
Rich, what features had you getting the RD bed vs the RS bed?
 
Vic Harder said:
Rich, what features had you getting the RD bed vs the RS bed?
Vic, when I went to look at the CMs at the local distributor, they had a few different types in the yard, both in aluminum, as well as steel. But only one of beds on the lot, the 84-inch RD, was the proper length for my specific 78-inch short-bed. The 84 inch RD simply looked correct, too, as if it were an OEM design. I did see the RS and other models as well, and could have ordered one that fit, but in the end, as it turned out, I took the RD that they already had on the lot, as it was the most appealing for my purposes, for a few differnt reasons. For instance, the RD has an HD 18,500 lb.-rated B&W bumper pull hitch with receiver tube, which is integrated into the entire frame. Ideal for towing or winch work or self recovery, if necessary, or simply to use as a hitch-step mount. On mine, for instance I use two flip-down aluminum steps, one in the hitch-receiver, and one mounted directly to the solid skirt just to the right and about 12 inches above the hitch to get into the rear door on the Hawk shell. The RS model doesn't include this integrated bumper-hitch. The RD model is also a bit more HD and resistant to stress with it's subframe crossmembers constucted of 3-inch, 3/16-inch steel channel. That is not available on the RS model. The RD has a tapered-corner skirt on the aft end and just suited my design plans better for building out my flip-down side rails and installation of additional exterior propane tanks at the tapered aft ends. This was probably more of a personal preference than a structural advantage. The RS is only available in a straight, non-tapered angle back, which is fine. The price tag on the RS is a little less than the RD but not significantly so. Both are well made. Choosing one over the other primarily depends on your intended use.

Rich
 
Adventurebound said:
Nice build! I've always wondered on these flat beds, can a spare tire still fit in the stock location?
Adventurebound, thanks for the comment. And that's a good question. The answer is yes! The CM, for instance, does not interfere with the trucks frame in any way. It is simply installed onto it, using both thru-bolts as well as spot welding in key locations. If you had, say, a spare tire that is mounted under the frame, and lowered onto the ground with a long rod, inserted into a hole in the bumper, then that won't change if you install the flatbed. The only thing you need to do, if the flatbed has an aft skirt, like on the CM RD model, is drill a 1/2 inch hole through the flat skirt panel so that the cranking rod can get to the spare tire receiver in order to crank it down or up. It's nice that you do to not have to lose that functionality when you swap out a pickup bed to a flatbed. On a side note the flatbed did not interfere with my airbag install - again, part of the trucks frame, not the flatbed's.

Rich
 
Vic Harder said:
Rich, what features had you getting the RD bed vs the RS bed?
Vic, one thing I forgot to mention was that the RD comes stock with a Gooseneck hitch, a 30K B&W hitch with welded ball that is recessed below the deck and accessed via a hinged aluminum trap door on the surface of the deck. I had no immediate use for it with my setup, but that might be an advantage for anyone pulling a heavy trailer.or just wanting to stow a little gear in that hideaway compartment when the camper is off the truck and used as a work truck, or whatever..

Rich
 
Vic Harder said:
Thanks Rich. Does the RD sit higher because of those steel crossmembers?
Vic, I don't know if the RD sits higher than the RS, not sure how they construct the subframe on the RS. My guess is that it is the same basic frame and same basic height, the only difference being they don't incorporate the steel crossmembers, which sit in the gap on the subframe that the RD fills in with structural-steel crossmembers. The RD flatbed does sit a few inches higher than the original pickup body, however, if thats a concern. But practically speaking it's not an issue unless overhead clearance, say for a garage door, where a couple of inches in clearance height might be ia factor. It's also not an easy step on the rear bumper and you slip into the rear door kind of thing, like it typically is on a lower-sitting pickup body. But that's a non issue with the right type of steps. Here's a link to a CM trade show video, if your interested, which shows the deck and subframe rails and crossmembers of a CM RD.

https://youtu.be/kl4CCYUdWC8?t=342

Rich
 
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