Cutting openings for slides.
We have built several 180 Ft. high 1/4 " plate smoke stacks over the years. Each one usually has large rectangular holes cut into the sides to allow the air to enter. Rule of thumb, each of those openings require a surounding structural collar equal in total weight to the material removed. If someone cuts a hole in the side of a bus for a slide the opening must be surrounded as described above and continuously welded to to the main internal structural members as a minimum. Further structural calculations are required to verify the strength of the structure as a whole including bending moments. I don't know about Prevoust being this careful in their engineering, but I have toured a major Motor Home plant and saw their prized Monocot chassis completed with incomplete welds on the tubing and complete side units hoisted onto the structure and screwed on with a few # 14 screws and on down the line.
With todays computer generated structural design analysis there should be no excuse for not getting it right.
I guess those of us that don't have slides and claim we don't want any will forever try and find reasons for not owning them.
We could order a nice wide modular home put somewhere. But thats not what were about.