It depends on the location of the off-grid camping spot and length of stay, etc., but long running gen times for air conditioning could be more practical with propane.
There are dual fuel gens and you can use those really big propane tanks that can be delivered to your spot by a propane company. Or have the extend-a-stay set up using smaller bottles.
IMO a set of two gens with parallel kit would be the way to go for that scenario too. A single gen that can do it would be too heavy for one person to deal with. (BTDT with Honda 3000)