The large 30+ gallon tanks have a set-up that allows towing with theTV. For extended outings I've dumped our Thetford and part of our grey water into a our 35 gallon tote and subsequently towed it to the dump station. By combining it with the gray water it's not took icky. Works great for me (I won't say "us" because DW doesnt want to know).
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Mario & Idie
'03 2720SL
'07 Tundra 4X4
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