How are you going to guarantee your work? Lets just say I hit a low branch and tore my roof.....you come by and "repair" it - I leave the campground and it rains and the repair goes bad......I go back to the campground I was at and you are not around!!!!
Also how about payment, will this be a legit business, charging necessary sales tax (if applicable) etc? how will you accept payment? We travel with very little cash, do you plan on accepting credit cards? Yes I know it has become very easy to do so BUT just throwing out thoughts for you to ponder!