Finding the source of the water damage is paramount. Locate a mobile RV service in your area and ask if they have/use a SealTec
leak detection system. It works absolutely! Your dehumidifier idea is perhaps the best option for removing humidity from your trailer. A moldy, musty smell can only be removed by completely drying out the unit as you are doing.
BTW, It's saddening, but you now must think about dropping the 8 from your screen name.
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"