Re:Trailer vs Truck?
I'd say your strategy for sales should dictate your choice. My city is currently working on rules to let trucks park on public byways. This would not be possible with a truck pulling a trailer, or at least much more difficult (roadside parking that is). If fixed position sales is your plan, go for cost. Trailers can have a ton of workspace, and are much cheaper, usually, than a step van. That said, I'm building a 16 ft International 652.
One day, I'll have enough posts to show the build. If I'm not too busy working!