It really only depends on how much amps you want to have while you are boon docking. The more appliances or 120 volt items you want to use at one time will depend on the size (amps of your generator) There are many good ones out there in the market place but first you have to determine your size of the need you want to run different 120 volt items at once. There are several places on line that will give the break down on what the amperage draw is for various appliances Now I'm talking about 120 volt appliances not your twelve volt system. But once you determine your desired usage when boon docking then you can shop around for the make of generator you want to buy