Don’t wait for your annual inspection (you do have an annual inspection of your RV, don’t you?) to search for leaks or to do something about the ones you know you already have. Ask any RVer that has ever had to deal with rot, mold, or mildew and they will likely regale you with nightmare accounts of serious downtime and scary repair bills. Rot, mold, and mildew are not to be taken lightly.
Any retained moisture in small spaces, such as are common in boats and RVs, should be taken seriously. If not attended to it can result in dry rot, mold, and mildew, which not only can play havoc with your rig but can also produce nasty smells and respiratory problems, especially for those with allergies.
Two remedies are maintaining adequate air circulation and using a dehumidifier. In fact, both would be advisable. Check after rainy periods and long road trips for water leaks — especially in those areas that are not easily visible and where pipes or hoses may have worked loose — and correct immediately. If moisture is detected, this is where you would put your small-space dehumidifier.
As long as you have an electrical hookup, keep the dehumidifier running in these hidden locations and check the collection tank periodically for water extracted from the air. Leave a window(s) open slightly and cabinets ajar when conditions permit to supply circulation of fresh air.