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.
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2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA.
" My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy