Looking at larger capacity inverter generators, they begin to approach the cost of two smaller units. Advantage of smaller units, lots less fuel, and if you don't need the extra capacity, you're only running one.
I have a 5500 open frame unit that I use at the house. If I could figure out how to get it in and out of the truck, that is one option... not one I care to use.
With this being a new venture, not sure where the wheels are going to take us, expect most travels right now to be well below where elevations will be a concern. WRT load, being a small trailer, and both fridge and hot water tank being dual source, could manage the rest of the load.