Glad you found your leak.
I found what may have been one where the awning bracket had tore the side of the camper.
I may have been well the previous owner got into a tree it looks like. And well tore the roof in 3 place over the toilet room, biggest was 3x5 v shaped tear. I'd noticed the wall looked like it had been wet in the past (the wall paper was wrinkled), but thought it was fixed, till some one used the toilet in the rain.
Good news I fixed a sloppy repair job, bad news is it's need a new roof including plywood under the membrane.
