Same thing happened in our 2006 Meridian. It started with the slides, then before long, multiple patches all over the roof.
If you are looking at Winnebago/Itasca, check the roof to sidewall caulking has been maintained.
Ours required checking every six months, and is a necessity to avoid leaks or worse.
2015 Dutch Star 4381
Workin on the road
Currently Houston Tx