Camper weight and 4WD

4x4 does reduce your capacity slightly because it subtracts from your GVWR. I don't think it will significantly impact a SRW since the rear tires tend to be what limits the ability to carry more. BTW, you could also go with a standard cab and gasoline engine to gain GVWR, also.

But, it also provides 4L to go low speed as necessary, and the ability to potentially have traction when the rear wheels are in less than great surface. This is potentially helpful turning around. Furthermore, 4x4 helps keep the vehicle straight in a low traction condition at higher speeds.

Obviously, if Class As and Cs can work, a 2 wheel drive TC can, too.

In those years all mfg GVWR ratings were a lot lower than newer trucks. I would guess 9900 or 10,000 pounds for late 90s trucks. With the weight of the truck that really does not leave a lot of room for load.

just my .02

the Axels are more that up to par for what you are thinking. Most of the 4x4 additional weigh is up front, most of the camper weight is on the rear dual axle. Note that the 99s have a much lower tag rating than todays trucks. Alot of that was to keep the purchaser from having to pay more in tag fees and not need a commercial lic which increased the availabe purchaser market for the MFG