I'll suggest something and do with it what you want. I installed this generator in 3 5th wheels, two Montanas and the Redwood. The generator sets lower in the cabinet on the Redwood than in some other 5th wheels because it is going straight down on steel plate:
On our Montana however, it sat higher. The holes in the base used for alternate exhaust routing (several) allow a lot of heat to escape into the cabinet rather than down under the 5th wheel where it should go:
I found out too late on the Montana that Onan recommends covering the unused holes with foil tape. As a result, we actually melted our cabinet door on the Montana. I don't know if it would have done that on our Redwood because of the position, but I taped them anyway as I had the starting cables running across the front down at the base and didn't necessarily want them exposed to the heat either.