I would say 3500 is a reasonable offer, at the end of the day as has been said it is cat c and a van convertion. It's going to put plenty off, ok, maybe some numpty will bid like crazy, but if it goes for daft cash then it wasn't to be.

Petrol will only take a few kangaroos to get the hang off lol!!

I would hold firm, remember you aint seen it in the flesh, could be a tatty or poor job done on it.