Hitch/carry capacity will kill that Idea, that has it include all passengers and dogs, luggage, ice chests, a full tank of gas, the hitch weight (200 pounds for a fifth wheel hitch) anything else carried in the truck, and the weight of the fiver. Also half ton trucks have smaller brakes not designed to stop a heavy fiver. And then there is the undersized transmission and everything else about the half ton.
You don't have an HD truck don't try to force yours to do the job of one. Get a good bumper pull.