Delamination is pretty common in that era or older. Given the location it could be caused just from the flexing that can happen at or around the hitch when towing. I've seen a lot worse. If there are no soft spots on the inside of the coach around those same areas then it's possible that it isn't a water intrusion issue as much as an adhesive breakdown issue.
Conversely, is there a washer/dryer up in that corner? Interior plumbing leaking could also cause this.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana High Country 305RL
2015 RAM 3500 Crew Cab 4x4 DRW
Demco Recon Hitch on RAM Puck Ball
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