[SOLVED] Work truck with service bed to tow a fifth wheel?

Solved? What's your "solution?"

There is a reason old service trucks are less expensive. It's not because of the service body. Those are in demand. People get in fist fights over a good used service body for sale.

The reason is they are rode hard, put away wet, abused, beaten. When they go up for sale, all the useful life has been squeezed from them. Those service bodies are nowhere near as resistant to rust as a conventional body. They're usually rotten inside, hinges seized.

A good service truck that is going to be the reliable tow vehicle that you need will end up costing as much or more than a conventional pickup.

Even without the technical issues of dealing with clearance over the service body, I would not recommend an old service truck as a tow vehicle unless you find that once-in-a-lifetime deal on a fairly new one, but you're going to have the same odds finding the same deal on a conventional pickup.