I one had a mobile unit that I used for visiting local fairs, sporting events, etc. Just be aware that you will be licensed for your county and state. You may need to get additional licensing to operate in a different county, and if you are located near a state line as I was, you will need to be licensed in that state too. Plus, depending upon your concept, your trailer may need to be licensed in the "other" state too. Just a whole lotta things to be aware of.
Tom Lehmann/The Dough Doctor