Originally Posted by SolomonEagle
I think one rib could safely be removed, in most cases, without the need for much reinforcement. If too many are removed though something would have to be done
They cut the hole in such a way as to make a 4" flange all around the opening.
That's not as strong as the ribs but that's not nothing -- and then the structure of the camper shell against the flange will act as a lightweight header.
It just means you can't dance on the roof where the hole is cut...
Or if you slide your bus into a phone pole the body won't be quite as strong where the ribs were cut...