I had to make a stop at Apache Camper and posed this question to the Service Dept Manager. He told me that after they put antifreeze through the line the faucets are closed. They have done that for years. When they leave the lot they are closed and under pressure. Also he told me to make sure addiquite amounts are in the toilet bowl since it will evaporate out. They put in about 3-4" above the trap.
06 King of the Road 37RLQS
06 Coachman Cross Country 5.9L 300HP 382 DS
03 Jeep Wrangler, 4.0L James, Trina, SMSgt, USAF Ret