[Shane826]

First things first, what A/C unit is that?!? It looks like it’s waaaay too far back on the riser with the rear hanging off like that.

As for your leak, simple test is to tape a garden hose on the roof so it’s pointed right at the front of the riser skirt. Open the camper and raise the front end just slightly higher than the rear. Turn on the hose, and watch for leaks. Positioning the hose here eliminates every point of entry possibility except the A/C area.