roof support
I was a Warranty person for Fleetwood and most, if not all of there TT are not to be walked on much if any. Did it have a luggage rack on it? If it did then you maybe able to walk on it right there. It will not take a lot of weight. Keep in mind that if somethings should happend and there is damage to the unit and pictures have to be taken and Fleetwood can kick the warranty out on it. They would be able to tell if people have been sitting up there.