Van G20

Hello guys, I would like to buy a Chevi or GMC G20. Unfortunately, as with all used ones, the joke lurks at all corners. Does someone know a serious dealer/privatist, who sells the parts fair to you and does not let you hang on to the service ? Eilt not so, must under some circumstances still save anyway, depends on what you have to spend. On eBay the vehicles are sometimes quite cheaply traded, however, I am skeptical (especially NO HIM). read about the topic ? Is there a magazine on the topic (G20) Vans ? Many thanks to all who give me tips in advance. Greenhorn