Or if you have time install a meter like this:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
so you don't have to guess what you're using.
Plugging a 50 Amp RV into a 30 Amp source will cut your available current to less than 1/3 what you are used to so you are limited to two major AC loads at the same time at best and nothing else.