I see this came up in the 5th wheel forum. I didn't read it all, so wondering how you can take along two 3000w gens. We carried the Honda 3000 in the truck between the front of the box and the hitch. It was too tall to go behind the hitch or the trailer would hit it.
OTOH, you could take along one great big gen up there between the cab and the hitch if it is not too tall to get hit by the trailer.
I see the object is to run two air conditioners at once. I suppose the answers are in that other thread I didn't read.