I know nothing about the 98 Chevy. I had a 2005 RAM 1500 short bed and it would have done OK with airbags though the suspension would have been stressed. I traded it in for a 2005 RAM2500 long bed. Same 5.7L gasser. The RAM1500 had lighter rated wheels and D range tires and only 1460lbs load, so it would have been overloaded easily with the Hawk or Grandby and all my stuff and trailer hitch weight. The brakes are awesome however in the 2003+ years. That is why they went from 16" to 17" wheels, for bigger discs.
With the 1/2T 1500 I towed a 6000lb new boat+trailer 1000 miles in the mountains no problem and after I got home, I looked at the 4 trailer brake discs and saw rust spots. After a trip they should be nice and shiny. The new trailer had air in the brake lines. After bleeding I finally felt what surge brakes really feel like when they are working properly. Truck never noticed.
When I got into the camper market I could not find a FWC locally so upgraded the truck and found a nice used 8ft fullsize camper a week later. I put air bags on to level the back and a rear sway bar on. Handled nice, probably 2400lbs all loaded up with my stuff, and then I tow a small motorocycle trailer. After I got the Grandby, it was light enough that I took off the airbags and rear sway bar and sold them. Worked fine though I wanted to lift the back a bit and so I put on Timbrens. I did not want airbags for offroad (stretching breakage). Drives very nice now, corners very flat.
The previous owner of my Grandby had it on a new 2006 Chevy 1/2 ton and he had no conerns that he expressed. He had 6000 miles on the combo.
In my case I run a hitch mounted motorcycle carrier often so I have an additional 400 lbs out past the bumper. I would not even try that camper/carrier combo on my 1/2 ton. I don't think twice with the 3/4ton. The gasser happens to be 2600lb payload (the diesel is rated 600lb less, heavier engine).
As for my Grandby, it is great. I put gas struts on and LED lights all around recently. I bought it locally here last February barely used, so it is near perfect condition. Furnace is nice for the spring and fall desert trips for my motorcycle events. With the solar panel on the roof I do not bother plugging it into AC ever. No fuss, no muss. The biggest issue on my to-do list is to make truck bed anchor bolt reinforcement plates before they pull through or bend up my truck bed too bad. I do like the extra storage room in a Grandby vs the Hawk, but often think about having the shorter wheel base for offroad use and easier parking. So far it had not been an issue, my offroading is rough forest roads at worst so far, not serious 4x4 challenges. I really like the low roof height to dodge low hanging tree branches on the forest roads. Given my frequent motorcycle trail riding/dusty road riding, I get good use from the outside shower, though only occasionally use the hot water heater. Only takes 15 minutes to heat up though. I use the camper with the top down on occasion, and with the top up it feels (and is) roomier than my full size 8ft was. Wife won't use a porta potty however, so it is just us guys camping these days. The full size had a self-contained wet bath, that was barely acceptable to her
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