Please let us know whether this is for while the the coach is in STORAGE or while in use.
If in storage, the best answer is a small (30 pint) home-style dehumidifier.
Set it on the kitchen counter or in the shower draining into the gray tank unless stored at your house where you can empty the container. Set humidity at 50%-- high enough that it won't dry out the wood and low enough that no mold or mildew will grow.
The first 24 hours, it will remove a couple of quarts, little after that.
We have done exactly this on all our motorhomes and sailboats for the last 40 years.
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240