We have the 4000 in ours and does a good job with air or heat pump. We boondock or camp in forest and beach CG's with no power several times a year. Running the Gen in the morning on the heat pump and the coffee pot or the Micro. Two of the heavy use items at a time are fine adding the third is iffy. Same in the afternoon evening to charge batteries for the overnight heat/furnace if needed, watching TV and cooking dinner. If it really gets warm going down the road we use the GEN and AC to cool the coach on the last leg of the trip to have comfort after setup.
LEN