Most of the people I camp with who have larger RVs never stay in RV parks. They just take them to town every 10 to 14 days to dump the waste tanks and fill the onboard tank with water. They boondock on BLM or NFS land. Their power is a combination of solar supplemented with some generator use. At this time of year they mostly use the generator for their microwave, coffee maker or binge watching satellite TV. On really hot days they will use the generator to run the AC in the late afternoon.