When I switched to a FW I seen a few models that could be optioned with the Onan 5500 generator. I know for sure the Keystone Montana and High Country lines could be had with a built in generator. Pretty much any of the toy haulers have generators built in as well. If you don't get a FW with one built in then you would most likely go with the portable Honda or Yamaha 2k generators. This is what I used to do and worked perfectly fine. Do yourself a favor though and go for the portable Honda or Yamaha inverter generators instead of a cheap contractor version. The portable ones are obviously more portable but they are also quieter and easier on electronics.