In that price range we found a 2006 Roadtrek 5 years ago on the diesel sprinter platform, and have been very happy with it. We might have found a class C for far less money but really like the sprinter base. And 22 mpg is awesome.
Not without issue; my various projects are on the forum...Electrical charging, battery and inverter upgrade, dometic 3-way fridge replacement and auxiliary cooling for it. It helps if you are handy and mechanically inclined (but that is true for any RV).
If you look for an older diesel, pre-2010 do not require DEF and that is one less thing to deal with.
Another interesting point. When we found the Road trek, I checked Blue Book and there was an asterisk* next to the listing that had a telling footnote: "For diesel, do not deduct for mileage."
And yes, we even flat tow a Cherokee with it.