I've got an ATC Bobcat, which I believe is the FWC Eagle equivalent, as the ATC guys used to build FWC's.
And, I drive a Ranger, too.
So, I'm not sure any of these photos will help you but, here's what I've got.
Forward eyebolts are very far forward, within 2" of the forward truck bed panel. Rear eyebolts... I'll see if I can get a measurement on tuesday for you, or at least a better description, as that photo isn't all that great.
Marty at ATC drilled the holes for me when I was at their shop and placed my order (4+ weeks to when I returned to pick my ATC up). Marty made sure the holes were drilled where there was a double thickness of truck bed bottom.
Rubber mat from the hardware store, about 1/8" thick with ribs on the top side, kind of a sticky material, keeps the camper from moving. Not the full width of the truck bed, doesn't need to be. This photo was taken right before I removed my tailgate.
An underneath photo (looking forward, passenger side) of the eyebolt location and of the bracket from camper/truck bed to frame rail that I decided to make.
Rear eyebolt and bracket from camper/truck bed to frame rail from underneath (looking towards the rear, passenger side).
I use these so, it's easy to remove the eyebolts when I have the camper off the truck. I can put my plastic bed liner back in, yet the truck bed/camper to frame rail brackets stay in place. Some think these are weak, however, I've never had an issue with these on any type of road. Plenty of threads, and they always take a bit of effort to loosen up, when I want to remove them.
Depending on how the Eagle is made, you may need to bring a small sledge hammer with you to beat down the Ranger, rear Faux gas tank filler tube clearance that may be formed into your truck bed on the rear left side of the truck bed (I'm not sure that every Ranger has this feature, mine is a 2000, 4x4, Super Cab). Ford had thought about offering a second gas tank to be mounted in the position of where the spare tire is, under the rear truck bed. Officially, as far as I know, they never offered it, however, a Bronco II rear gas tank will fit in the space nicely, if you can figure out another place for the spare tire.
Here's the forward "real" gas tank filler tube clearance and the photo gives another idea of where the forward eyebolt is drilled.
Here's the rear Faux gas tank filler tube in the rear, after being beaten down and before re-painting, and, this photo also shows where the rear eyebolt is drilled.
The guys at ATC gave me a choice when I placed my order, 1) they could leave the camper as it is normally built and I would have to beat down that rear Faux gas tank filler tube clearance, or 2) they could cut off the forward corner of the wide rear section of the floor pack where it would contact the rear faux gas tank filler tube clearance and place a piece of floor pack material over that cut off section. I needed the camper as originally built, as my porti-a-pottie sits in that space and I wanted every inch of it. So, I decided to beat the rear Faux gas tank filler tube clearance into submission (Marty started and then I finished the job). I'm pretty sure everyone watching was sure that I was going to knock a hole in my truckbed, but, it just stretched and stretched, no cracks, no slits and no holes.
Hope that makes sense. Once you see the camper in that back left corner area, you'll know if you have to do what I decided to do.
I hope that gives you some ideas.