You should be OK putting a long bed camper on a short bed truck.
A 3/4 ton short bed would be the best truck for it, but we have cutomers doing it on the 1/2 ton trucks too (from time to time).
I had a Grandby on our older Ford F-150, Extended Cab, Short Bed truck for a couple of years and was happy with the way it drove.
I wasn't doing any crazy 4-wheeling, but I was comfortable going most anywhere with it.
I did have a stiff rear suspension upgrade on the truck and was running load range E tires for it.
You will probably get some good feedback from other on the forum too.
With the four wheel campers, we recommend leaving the tail gate on the truck to give the rear of the camper some extra support.
Other details from our website ..
Can I put a long bed camper on my short bed truck? Yes, but with some simple considerations you should be aware of. Many owners purchase a long bed camper and have it installed on a short bed truck by leaving the tailgate on the truck and in the down position. In this case, our camper design does not really interfere with towing trailers, but having your tailgate down might decrease your turning ability or require you to get a hitch extension so your trailer does not hit your tailgate. When putting a long bed camper on the short bed 1/2 ton trucks, most of our customers will usually get "over-load springs" or "Air Bags" installed to help stiffen up the rear suspension of their truck. It is not really the extra weight that requires the rear suspension upgrade, but where you are putting the weight (too far behind the rear axel - might squat the rear of the truck a bit). We can install SuperSprings or Hellwig Springs here at the factory for your truck for an extra charge (www.supersprings.com) (www.hellwigproducts.com). For 3/4 ton and 1 ton trucks, most customers do not need any type of suspension upgrade to put a long bed camper on a short bed truck.
Another important consideration regarding putting a long bed camper on some of the newer short bed trucks: "Spare Tire Access". On many of the newer trucks, access to get the spare tire out so you can use it, can only be accomplished (easily) with the truck tail gate up (closed) or with the truck tail gate removed. When the truck tail gate is down (in the lowered position) many times it blocks the access hole to be able to crank down the spare truck tire. Example. If you have a long bed camper on a short bed truck with the tail gate down, and you get a flat tire, you most likely will have to remove the camper temporarily from the truck (on the side of the road) to be able to change your flat tire. Not a big deal for most customers, but it could create a big problem if you are not carrying camper jacks with you !