That depends on what you’re trying to operate. If you need to operate 120v appliances without running a generator or being plugged in to shore power, an inverter will do that. Many Travato owners travel with portable inverters to run small appliances. They will NOT be able to run your microwave or air conditioner, though. Inverters capable of running your air conditioner or microwave are large and expensive. Their installation in very involved and requires professionals to do it.
While we don’t recommend one specific brand of portable inverters, you can see a list of 12v inverters on Amazon HERE.
It should be noted that using a too-large portable inverter would blow the fuse. DO NOT USE a portable inverter rated for more watts than the circuit you’re plugging it into. (If you don’t know what that means, don’t use one.)