The Gen prep is designed for the Onan 5500. So yes, it will fit. We installed one in our 2017 Eagle 293rkds. I put sound deadening material in my compartment prior to installing. I also added a couple more CO detectors.
2017 Eagle 293RKDS, factory ordered, lots of mods and upgrades. More than I can list.
2018 Ram 3500 crew cab long bed SRW diesel 6spd Aisin 4wd Tradesman.
B&W Ram puck 5th wheel
Mopar wheel to wheel steps