1995 Tioga Montara

You might consider buying a used "portable" generator but it will need to have 4000 watt capacity to run your roof AC unit and microwave oven at the same time. It could be mounted on the rear bumper on some kind of a sliding mount so you would have access to the rear cargo bay door. My advice, save your money and buy a newer rig with standard RV generator that starts easily and works properly to run the roof AC, etc. BTW, people who camp "off the grid" often go with expensive solar power and large banks of batteries and high capacity inverters. Running an RV generator a lot is an irritant problem when camped near other campers.