So I finished my dump today at CW, I knew the tank had only drained about half it's contents at the SP dump station. local CW dump station is located outside their fenced lot. Got there a little after 6:00 pm no one else there. Blocked the low side as pad tilts slightly away from drain, hooked up flusher hose, connected slinky and opened valve, NaDa, turned on flusher took a couple minutes and the blocking wad came out. spent 10 to 15 minutes flushing tank to clean water.
Just as I was disconnecting, up drives a guy with his TT in tow,hope he had as relaxing time as I did!!