[C&P RV]

If you have the factory generator prep, it is set up for a propane powered Onan generator. Probably the model RV-QG-400 or similar which costs close to $5,000. I have a Predator 3500 portable inverter generator that rides in the bed of the truck forward of the hitch. I connect my regular power cable (with a 30 amp/ 50 amp adapter) and run it from the truck bed unless we are staying somewhere that I need to pull it out.
One plus from this option is you can use the generator for other needs if that applies to you. We've used ours on several occasions when the power was out at our home to keep the refrigerator and freezer running for example.
The Predator is under $1000 from Harbor Freight. Check YouTube for reviews. Honda is always a great choice but more expensive for the equivalent output.