HOST , LANCE , slide-outs fiberglass skin fatigue.

3 tons wrote:
It’s been my experience that when it comes to truck campers, the notion of ‘engineered’ is often generously applied…

3 tons

Not just truck campers, RVs generally.

When you knock the side out of a box, there is significant and heavy structure required to replace the stiffness that side provided. With small slides there is still enough wall area to maybe make up the structure, but with large slides the side is simply compromised.