The "issue" of carrying longboards was a major determining factor for me in choosing which RTT to buy. This is one reason why I decided on the Magiolina Grand Tour which allows you to mount crossbars on it. I carry 2 longboards up there and I can raise the tent with the boards on top. An added bonus of them being up 14 feet in the air is the extra night time security in Baja. On my truck the crossbars on the top of the tent are 8'8" off the ground so loading boards is a bit of a pain, but manageable. It gets a bit of a "grapes of wrath" look with the tent on the Land Cruiser and then the boards on the tent.
I never seem to be able to post pictures on this site, plus I don't have any of boards on the roof with the tent up.