I took delivery of my second safe today (Champion Medalist-30 w/custom inserts for longguns only)

It has a rod that you're supposed to leave on to fight away moisture and combat rust, corrosion etc etc)

1. Does anyone use such a thing in their safe(s)?
2. Does anyone recommend using it on and off for a set period?
3. If you do use one, have you ever dried out old wood stocks to the point of danger?