How common is common.
I have been reading a thread about holding tanks falling out of a rig while traveling down the road.. I have been RVing for over 50 years and had never seen this happen. Or heard about this happening...
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The reason why this isn't an epidemic is probably because most people don't travel with full tanks of water. Water hookups at sites are everywhere these days so you only really need a little bit of water just for the road. I think manufacturers take advantage of this and design minimalist supports for that majority. They'll then put notes in the manuals warning against traveling with full tanks. If we all still traveled with full tanks, I think we would see even more tanks dropping out with the current supports.
