In the shooting world it is fairly common to see guys with trailers with reloading benches and small gun smithing areas set up which would be pretty much what you are looking for. There are 4 basic styles you will see. Pick up with camper pulling a 6x12 or 7x14 cargo trailer converted to workshop with lights, heat and A/C. Small motor home pulling the workshop trailer. A long 22-28 ft cargo trailer with front living quarters and rear workshop or sales area. Or a large converted TT or 5th wheel with 2 doors. Front living area access via the front door and shop through the rear door. The down side to all these designs is that they require serious horsepower to move. 3/4 or 1 ton trucks that are mostly diesel powered are the norm.
