Starting my own business

the drummer in my band and I were talking alot lately and decided we needed some money to finance our band's stuff. We're going to open a concessions trailer. We want to sell funnel cakes and shaved ice and stuff like that. After some research we decided that our biggest thing we need to finance for, and what we need to acquire first, is our trailer. Does anyone know of a place that sales them for cheap, perhaps used ones? How tough would it be to take a regular aluminum trailer and build it into a concessions trailer? There is a place across the county from me that has a fleet of about ten concession trailers, and they occasionaly sell their used ones, i just haven't had a chance to go talk to them yet. And thought i'd see if anyone on TB had any useful information.