Flooded storage comparment and furnace supports.
Two recent heavy rains while driving caused two storage comparents to get soaked in our 2017 A40. The hydraulic compartment had 1/2" of water in it. Check all of your storage compartment doors and check for missing screws on the bottom of latches and adjust door catches by simply moving them either up or down or side to side depending on how doors are designed.
On same drive the rear furnace support shelf in rear bathroom came about due to inferior white pine construction. As a result the furnace housing moved to the outside wall causing access cover mlunts on bottom to break. The bottom buldged out about 3/4", all while driving through heavy rain