Payload on used truck?? -- can't weigh beforehand

For a camper that heavy you should really consider a dually. Sorry.

Remember to add 1000-1500 pounds for to the payload for all the stuff you need plus the manufacturers aren't always honest with their weights.

Anything is doable I guess.

We are over our factory spec of 4500 pound payload for our dually..

On another note having retired from construction I can say that if the toss up is between a ford or a chevy for new truck I would recommend chevy if Ram is out of the equation.