According to my calculations, if the flushing toilet consumes 1.5 pints of water per flush, you'll need a black water tank of about 10 gallons to get about the same user-days as what you get out of the Thetford.
See this thread:
http://www.trailmanorowners.com/foru...ad.php?t=10956
Dave
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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