When we do Quartzsite, the portapotty rig comes out, connects to the drain and with all the drain valves open, sucks all the contents out. Most of the rigs are very full and never an issue with collapsing tanks. Even with fluid above the vent pipe, air will still be drawn in as fluid is removed, so the tank will not be affected, plus, with the tank that full, it's hard to imagine it could collapse. The bigger issue is finding a company that has the bayonet fittings to make the connection to the drain pipe.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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