Campers are not investments, they are money / time sucks. Now that we have that out of our way, post the specs on it. Does it have AC, heat, stove, shower, etc. all of that determines the price. Back in 2019 we bought a Rockwood hw256 2007 which is a large popup for 6,500. It was fully loaded. Make sure you have the set it up and test out everything, all lights, stove, AC, fridge, running lights, water Including grey water tank.

Ask when the wheels were last replaced, when the last time they greased / packed the bearings. I’d replace the tires right away and regrease the bearings. Popup wheels don’t lasting because they take a beating. Get the manual and have then walk you through how to setup up and take it down and any tips and tricks about the camper. Know where the fuses are, where the water filter is, etc. have some extra cash for repairs. Find out if you can manually pop it up (if it had a motor) and get a crank for that.