I've been stuffing a bath towel under the filter housing. Since it's in the seperate compartment with all the water fills etc, if it gets a lil' bit wet just mop it up and let it air dry. The compartment has a big scew-off lid to route my water hoses and tv cable down and out the bottom.
2010 Cedar Creek 5th Wheel 34SATS "The Beast"
2006 Ford F350 Lariat 6.0L Diesel
2003 Harley Heritage Softail "Hogzilla"
1988 Harley Softail Custom "The Fireman"
1986 Marriage to "Wifey" (patience of a saint)