Keep in mind that solar generators generally cannot generate as much juice as gas or a direct electrical hookup. Fuel TypeMany RV generators run on gasoline, but there are also dual-fuel generators that allow you to use gas or propane. PortsIn addition to the standard 30-amp/120-volt outlet that you want to properly hook up your RV, the best RV generators will have a variety of plugs that will allow you to power or charge other devices directly. Noise LevelSince any RV enthusiast is bound to find themselves in a campground or RV park during their travels. Traditional, fuel-based generators are often louder than this, so for RV use, we recommend using inverter generators.