I think you missed something important...
Generators come in 2 varieties. (3 actually but the third is of no consequence)
Cheaper units run at 3600 rpm. The more expensive ones run at 1800 rpm. The necessary speed of the engine is determined by the number of “poles” in the generator.
The units used in motor-homes are almost always 1800 rpm. There are two reasons for that; First, they are much quieter. Second, the life span of the engine is much much longer. If this is a generator that is going to be run 24 hours a day, you do NOT want one that runs at 3600 rpm - period.
The 1800 rpm units are more expensive because the engine has to be larger, but you really have no choice here.
Well I know I’ve learned something today. Thank you.
Any suggestions? Brand Names?