I need to buy a generator for my food trailer and I am confused. How big a generator do I need? Is it a 3500 watt, a 5500 watt, a 6500 watt, a 8000 watt, or a 1100 watt. Different pople I talk to have different opinions. I have an 18 ft trailer that has an air conditioner, shaved ice machine, 5 cubic (small) freezer, commercial fridge, tripple crock pot, buffet roaster, and microwave. I really appreciate your input.