why do RVs seem to leak so often compared to normal cars?

Question

Compared to houses, RVs are put under lot of stress when driving, but so are normal cars, so why are RVs specifically prone to water damage from rain or snow at considerably shorter distances than normal cars?

In: 2

Answer 1

The are larger, have more joints where panels connect, the large empty boxes on wheels, with thin frames and thin walls to keep weight down, means less structural rigidity and more movement of panels; they have moving parts like slide-outs, they are notorious for poor build quality