I scanned it from an early 1990s ATHS "Wheels of Time" magazine's for sale section. I think the actual truck was green.
If you look at that particular model it is actually a Diamond Reo Raider before the Raider was offered.
I read somewhere that those guys made some double bunk Astros. Could this be one?
http://www.roadtransport.com/blogs/big-lorry-blog/2009/09/on-the-road-to-antarctica-with.html
Not much if you use an air brush. Also warming the spray can in tub of hot water will make the spray thinner.
BTW, you're suppose to prime the plastic any way.