yes ,, good idea ,, if it has no ladder ,, then the roof is prolly not strong enough to have anyone on there ,, but if u have to go on the roof for say repairs and such ,, i would use some 2x6's or 2x8's long enough to go to the sides of the walls ,, and walk on them ,, i have doen this many of times on rv's that did not have a ladder ,, and ones that i knew had some water damage to the roof area ,, btw welcome to the forums