I never use such a support. Usually, one does not leave the tanks open - especially the black. I may leave the grey open when both the wife and I are going to take showers, use the washer/dryer, etc. Even then it drains well just laying across the ground - and when I dump I lift the hose at the coach end and walk it to the drain to empty it completely.
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Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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