If yours is a 98 I just opened my 32 ' roof up from rot. The truss's are 6'" x 2". I weigh 280lbs. I stand on my roof no problem. Anything of a decent size should have a solid roof. Kinda glues the walls together on top.
1998 Jayco Eagle 323 RKS Fifth Wheel
2003 Dodge Ram 3500 Quad Cab Dually long box Cummins HO
Andersen Ultimate 5th wheel to gooseneck flip ball hitch