I haven't carried a generator yet. I have 2 Honda 2000's that I plan to just set on the truck rear floorboard when I travel. My A/C is 11,000BTU and just 1 of the Honda's doesn't run it well. It did once, but not another time. I wish I had the 9,000 BTU Coleman Cub.
You may want to look into a rear cargo carrier. I have one and my scissor steps will just clear the rear edge. If you have the new Bigfoot rear bumper plus steps, I'm not sure how a carrier would work. I would have to look closely at how to store the Honda outside to prevent theft.
Congrats on the Bigfoot! Excellent choice.
2018 Ram 3500 CC LB DRW 4X4 Cummins Aisin Laramie Pearl White
2018 Landmark Oshkosh
2008 Bigfoot 25C9.4
2014 NauticStar 21 ShallowBay 150HP Yamaha
2016 GoDevil 18X44 35HP Surface Drive