Need help - Catering/Events

Sorry if this is in the wrong spot. I have been Q'ing for a few years and wanting to get into catering and festivals. My delima is that I don't know if I want to get a closed in Q concession trailer or get a smoker on a trailer and add charcoal grill, sinks and burners and use tents and tables to complete the set up. My biggest thing is the things that need to stay cool. Like the tater salad, coleslaw and drinks. If I go the smoker on a trailer route I will need to keep all that stuff in a cooler. I like going that route because you you hit one of the peoples sences which is sight. Can someone give me the pros and cons. I just need help

Thanks