We purchased a champion 3500 hybrid at the dealership when we bought our Monty. Paid too much for it. Way cheaper on Amazon. It is very quiet for a generator. It has enough power to run one of my two AC units plus other things. You has to manage your power usage carefully though. Many have purchased the harbor freight model and are happy wit it. I will buy a motor snorkel for mine and have the option of running it on gasoline, propane or natural gas.
https://www.motorsnorkel.com/