I've had my mobile oven from the The Fire Within for about 3 months and have done several festivals and other events. There is a learning curve on how to staff for the various events. I am the only game in town and will be amping it up when current full time job ends on the 31st of this month. Training staff to get the quality you want is an issue. Managing my dough right now is my biggest battle, I'm getting a better handle on this. If you lose power at an event your dough can get away from you quickly and that has happened to me twice at big events. As others have said having enough space to carry all your equipment is definitely an issue, about to buy a cargo van for this. Having said this I love this business and your customers will love it as well! Good Luck!
Google FLIP insurance, its a group program targeted at the food industry, great rates that includes the inland marine insurance you will need. I think its $299 yr with unlimited additional insureds included.