When the unit was winterized, was the black tank drain plumbing drained or had antifreeze added. If it did not leak last year and the drain line was not drained or winterized, it may have frozen and cracked slightly.
2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 65W solar panels