I drive a 2004 Damon Challenger 34 foot, gas class A. After driving home from AZ with no problems, I parked the rig for 3 weeks. Now, both the 2 coach and 1 engine batteries are death. I often park the unit for 6 to 8 weeks and have never had a problem with the battery power. Also, I had the battery disconnect switch on so not sure how anything could be drawing power. I have not yet tried to jump the engine battery or checked the batteries water level. The batteries were checked and water levels ok in January. Any suggestions before I go looking for the problem?