Any RV with 30 amp (3600 watts) shore power requires power management. It will just not support all the various electrical loads at one time. The same applies to 4000 watts of genny power.
Get to know what you can run together and a pair of 2000 watt units in parallel will be fine.
I get by well with a single 3000 watt Honda inverter genny because my A/C is only 10,000 BTU.
2015 T12RBST Flagstaff Hardside
2008 Itasca Meridian 37H