I have not heard much on this forum but on the forum of my previous 5th wheel manufacturer, I heard about a lot of leaks and breaks in tanks. Some thought it was the way the tanks are supported but others thought it was from defective tank manufacturing. I happen to believe the latter. Somewhere on UTube there is a video showing the manufacture of these tanks. It seems to be a very un-sophisticated way of tank making (but, then again, what do I know about making plastic tanks
). Somehow the molten plastic is "spun" into a tank. I guess it works but there seems to be no way of making sure the "plastic" is of uniform thickness throughout the tank.