The FWC is very simple, the other campers are as you say plusher, and have some sort of mechanical roof lifting system (which I like) as others have mentioned you will not find a lighter lower profile camper than the FWC, and yes they are "trail rated" for sure. If you will be keeping to the smooth roads and need more amenities then you should take a look at the other brands, but try to find one with an aluminum frame. The FWC Hawk will be fine weight wise for your truck, but you will probably need to add air bags or some other suspension upgrade to the rear, as with the extra short bed the camper will be hanging over the back and the rear of the truck will sag a bit with the weight carried that far behind the rear axle.
Good luck, ask lot's of questions.