Originally Posted by JanelleS
How do I find out if the roof is walkable? 2017 Sunset
Aside from the obvious answer: Try walking on it and if you fall thru, it probably isn't walkable.
Besides that, a roof access ladder is probably the key, No Ladder, No Walkie. At least I wouldn't be attempting it.
I polish and wax our trailer every year and I place some plywood sheets up top so I can access the front of the bubble, if I happen to place a knee on the roof (not on the plywood) I can hear the distinctive sound of plywood cracking. There are a few places this doesn't occur but I think those are where the roof stringer (joists, ribs) run.