Guess I'm the odd ball. I cook everything fresh for both concessions and catering. Yes this means up most of the night even when I do get to lay my head down it's barely considered resting. When I sell concessions I pull my trailer to my spot and my Lang 84 by making two trips early 7am on Saturday mornings after cooking most of the night. We will usually sell from 11am-3pm as late as 5 or 6pm. Then I pull my Lang home and go back Sunday morning and get my concessions trailer.
I would not recommend this as it is exhausting. I can do it as much as 3 nights in a row and then I am dead but usually only 1 night. One day I would like to upgrade to a 24ft trailer and a Southern Pride but that will require going full time to even think about paying for it.