Hummmm, I'll have to take a closer look. The support arm covers on my RB come all the way down to the rear part of the bed as it is. I have some 2" egg crate foam I tried putting up there. It makes the bed more comfortable, but I can't leave it in place when lowering the top. When I do, it pushes the back of the penthouse about 1-1/4" off the roof and I can't latch the back down. As you say, might be the difference between the EB & RB.
Anyway, thanks for the info.
You can be anything you want on the Internet,
it amazes me that so many choose stupid....
2007 RB50, 6.0