General Contractor Building Concession Trailer????

Hello everyone, new member first time post. I am investing my savings into a small concession trailer. 6x8 or 6x10. I am keeping it simple with 4 or 5 signature kabobs with the occasional special. Chips and soda. The only cooking apparatus i will need is a charbroiler, which I am thinking 36in. I guess my main question is would it be a good idea to buy an empty trailer and equipment myself and hire a general contractor to build it? By general contractor I mean a handyman that knows how to build a house but not necessarily a food truck.  I cant seem to find a builder that can do it in my price range. $12000 is my max. I am not handy enough to do it myself. If not a good idea, any good builders out there? I have a floor plan for a 6x8 that would be perfect. Thanks Zach