I bought my first 5th wheel in N/cal from a typical Rv dealer. ( Santa Rosa Rv. no longer around)
It was a 26' Wanderer by Thor with no slides. Great deal. I forgot the GVW or the hitch weight, but the selling dealer told me that my 73 Chevy 1/2 ton would pull it just FINE! I just rebuilt the whole truck, Engine, trans, suspension, r/e brakes everything, except the rear leafs. .
I believe the hitch weight was around 1500lbs or so. The Chevy had a stack of leaf springs I think about 7-8 deep. I thought it would be fine too, as the leafs were really thick... ... ... ... . The same stack you'd see on a 1+ ton nowadays.
Anyhow, on the pickup day, they lowered the 5th onto the poor 1/2 ton 73 Chevy and the bed went down to level, then kept going down ever further. I thought " Holy COW", those stack of leafs are bending over like nobodies business... .
Anyhow, I drug the 5th wheel home, tail sagging between its legs, to the storage lot and began my search for a REAL P/U.
I found a 97 Dodge CTD dually 5 spd 2wd and never looked back. Bought a 05 dually new and have never had problems towing any of the 5th's I've had since.
The 97 towed a Alpenlite 36' 5th that was 14,500 and didn't blink once. She pulled it in cross winds, you name it. That convinced me dually was the way to go. PITA some times parking, but beyond that, can't beat'm.