I am not a 5th wheel guru nor do I have one. BUT, let me say this. I see many BIG 5th Wheel trailers being pulled by some 1 ton trucks that look like they would be better handled by a medium duty truck like a frieghtliner or whatever. I had a friend who had/has horses and he towed his gooseneck with a 1T chebby dually. He broke down several times and finally got a freightliner and he said it was the best thing he ever did for hauling the horses and stuff. Yes they are big but so are the 1t duallys. The bigger trucks cost a little more but there are many out there used for sale. Bigger engines, transmissions and brakes are the key things. Besides in some states you can double tow if need be and if you have a 1 or 2 horse trailer bumper pull it could be attached to the 5er maybe, but I would not recommend. Friends do this with pontoon boats and boats but with a a couple of tons of horses?
Anyhow these trucks can be plushed out but most have air ride, air ride seats, etc and are about the equivelant of a big class A MH in comfort. There have been some on the lemon lot at DMAFB at times seen KW's and a peterbuilt there once. Just something to think about
