Hello,
I have spent many an hour on the top of both of my units, the 30 footer
is much safer than the 18. Note on the 18 the ribs running from floor to
ceiling are structurally sound and will hold some weight (221 of me!)
but never trust the cross the top supports, they are pop riveted to the
skin and NOT attached to the ribs in a manner I would trust, they are
just sort of sitting there. Stay on the ribs on your Butt don't stand
up! (Said from a safety guy)
Ed
WBCCI 4425
68 Sovereign
59 Traveler