I have a 2000 George Boy this is a Class C.
My leaks were from PO not attending to the roof.
Knock on wood, no water tank or line leaks.
All lines are plastic / vinyl that can be bought
by the foot at home improvement stores.
The only way you will feel secure is to either trace
them out yourselves an look at all line and connections,
or pay someone to do it. Leaks happen but are not normal.
We are K&K for Kathy & Ken - Both retired.
She accounting, he Law Enforcement