I'm designing my U500 camper and I need to know the U500 dimensions. I haven't found anything that will show me how high the bed is in relation to the height of the roof. I know the roof is 115in so if I had the height of the bed I would know how tall my camper can be. I want to limit it to the height of the cab so I can go just about anywhere. Thanks in advance. I red the bed is 135in X 89in. hope that's correct.