It's really a simple case of adding up the "draw" of each appliance to determine what you can run with a particular size generator. After you have the numbers for all the appliances in your unit, determine what will be running at the same time, add some additional capacity for a safety factor and you should have what you need to properly size a generator. For example, a 300 watt generator will operate 1 A/C, but WILL NOT operate 2 A/C'a on your RV.
Days camping (2015)----88 days
Days camping (2016) ---110 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi
30 years RV'ing
12 different RV's