I don't suppose I'm the only one who has to deal with this, I'm in an older Dodge motorhome, a Class C Tioga. It's my residence. I don't have a brick and mortar house to retreat to. The ceiling ...
Consider having the rig pressure tested - should expose all the leaks and give you a better idea of what it's going to take to fix the leaks .. cost about a $100. Don't bother restoring interior until your sure it's watertight again.