Yeah, it looks like it has been repainted but it's faded or marred in some places. You can see a couple of areas on the rockers where rust has been puttied.
You'd have to check for rust up by the steering box and by the rear spring hangers as those can be structural problem areas.
It was pretty common for late '80s and early '90s Dodge odometers to be non-functional,so mileage should be suspect. Probably many were changed out.
An '88 with a 360 will have a 4-bbl carb instead of TBI (a version of EFI). For some that would be a plus, others a minus. Also no computer to deal with. It doesn't have overdrive, so those 2 factors would make some difference in MPG compared to a more modern van.
The trans would be a 3-speed A727 which is one of the sturdiest trannies ever built. It 'should' be cheaper to have replaced or rebuilt compared to the OD trannies.
The build is kind of crude; nothing special for that kind of money and it doesn't seem to have a sink or tanks. There's a CO detector but no mention of a heater. If used in cold weather, the canvas on the poptop wouldn't offer much protection.
Lastly, I would avoid old vans with sliding side doors because they're prone to being jammed or coming off the track.
The ad doesn't mention whether the cruise control or A/C works or not. I'd bet against both but you never know.
Unless it's been converted to 134a, the A/C on an old van would require R12 freon which is expensive.
So anyway, it's a pretty cool old van but I'd say it was overpriced by at least $4000. JMHO