The answer to your question you asked on windows is that with the popular you do loose a window on the drivers side. Both the popular and versatile have a window back at the bed, and then a kitchen window around the sink area, but on the popular there is no window behind where the driver sits, but there is on the versatile. This is because since in the popular your bed is front to back & longer, they push the kitchen further forward and as a result you loose a window. On the versatile you sleep side to side with your head facing the passenger side of the van, and the bed is shorter. I am just under 5'8" and find the versatile bed just fine. I think a 6' person might not like it unless you don't mind sleeping at a slight angle. The versatiles were designed to seat 4 persons up front, and the populars were designed to seat 3 people up front, meaning they have one less rear seat. As far as we have been concerned, the only dis-advantage to the versatile is that the person sleeping on the outside has to crawl over the one on the inside if you need to get up during the night. But I sleep on the outside and I rarely need to get up, and it really is not difficult so far. All of the Chevy 190s were built on the 3500 chassis. If you want a Dodge 190 it will have to be pre 2004 because 2003 was the last year for them. The 6.0 engines started in 2004 I believe, but I know for sure in 2005 the 6.0 was standard. Sometime after 2008, not sure exactly when, they started using some 4.8 engines, but the 6.0 was still available. We have the 6.0, and personally I would not want anything else. It has been great. I hope this helps you out. Feel free to send me a PM if you would like more information.
Steve & Chris
2006 190 Versatile
Ashland, Ohio but currently snow birding