I have the same issue with collecting rainwater. I have found that it collects around the front of the bathroom vent. Lowering the tongue helped but it also will collect around the rear of the vent. My conclusion is, it helps to tip it low but it does not solve the problem. I have been careful to keep that area of the roof well waxed. Your experience may vary.
Not related, but in the same area I had seeping through the rivet holes for the bathroom vent. Some very minor wetness on the toilet seat. Here I found the rivet holes had been covered with a white caulk, not able to determine what type. I peeled the old caulk off by hand, it was a nurdle on each rivet, and replaced it with a dollop of Dicor type RV caulk. Problem solved.
Paul and Janet Braun
2003 Toyota 4Runner V8 now 2012 Toyota Sequoia V8
Escape 19' 2010 now 2014 Escape 21'