Below is the reply from Jayco. I think that being that the roof is perfectly flat, no pitch at all, it would seem reasonable to me that the weight of the air conditioner would cause the roof to drop just enough to cause a small puddle when running the air or after a rain. During storage I am going to pitch the trailer more than I have to keep the puddle from forming. Even though Jayco is not concerned witht the problem, I think that keeping water off the roof during storage would be a good way to prevent the posibility of problems if the air conditioner seal fails.
"I understand you concern for water pooling at the AC location. When the AC bolts are tightened down they are applying quite a bit of pressure in that location. This is common with this type of roof. We recommend you drop either the front or the rear after a rain to allow for runoff. The same can be done while using the AC. Continue in the future checking the AC bolts for proper tightness after long travels or frequent travels during the season."
2015 Starcraft Travel Star 299BHU Black Pearl Edition
2011 Jayco X23J (traded in)
2009 Ford F150 FX4 SuperCrew