I have no advice for drying the wall, but I do think leaving the moisture in the wall will create mold and mildew. I do have advice for finding any/all leaks in a RV. Locate a RV repair center that uses a Seal-tech
leak detection system. Some call it a leak-tech system but it's the same thing. There was a water leak in our 5er the first rain after taking delivery. The dealer used the Seal-Tech system and located two leaks sources. The leak source was found over 10' from where I saw water. I think the cost is >$100, If your RV is not covered by a warranty.
Another thing I discovered on our old 5er was water filling the clearance light lens, then running down the wiring into the wall. I solved this by drilling a 1/8" hole in the bottom of each lens.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"