Mine has a 6500-watt (50 amp @ 120V) generator. Like someone else said, the size of the generator depends on how the rig is optioned out. My shore power is only 30A so I can only run the front A/C unit. With the generator I can run both the front and rear. I bring all of the comforts of home (Keurig, toaster, hair driers (for the womens), etc.) to our annual NASCAR trip (which is totally off the grid) and the generator does fine. Have I tried to run everything at once? Heck no. But 5,000+ is plenty to run whatever you want - just not all at the same time.