This is a common problem with HR/Monaco units. Our 2007 Endeavor leaked around the door for years. Water runs down the side of the unit. Surface tension of the water and gravity will allow water to run around the top edge of the trim onto the top of the door and drip inside.
Looked at what other manufacturers did around the top of their doors. Bought the flexible gutter material with adhesive backing and applied it around the top of the door in an arch to channel the water around the door. Problem finally fixed
2016 Winnebago Journey 40R
2018 Rubicon
1982 FJ40 Toyota Land Cruiser
2020 Keystone Outback 327CG
2020 Dodge Ram 2500
Polaris RZR XP 1000
4 Cats
3 Dogs
1 Bottle of Jack Daniels
Two old hippies still trying to find ourselves!