I keep mine inside the HTT. Particularly the bathtub. Of course I do not dump the black tank in it, just the grey one. In my limited non full-hook-up travels, I have found that you have to on a really long camp put to fill a black water tank. That is to say if you follow Chuck's recommendation and remond people that you do not need a full bowl to flush, just enough to drop the goods. Since it is just grey water, I do not have that big a problem with it.
No, really, tho. We spend 4 - 6 winter weeks in the BLM desert of Yuma AZ. Last year we went 10 or 12 days on gray water with very conservative use and showers elsewhere. I don't like moving our FT trailer down those bumpy gravel roads any more than necessary.
Put the tank in the trailer! I can just picture her face. Ha ha ha!
Kidding
Bruce and Jenna
Denby, the Pembroke Welsh Corgi
On the road in America
Fulltime in Sept 07
* 2007 F350 PSD DRW Supercab Lariet 4x4 TowCommand 4.3LS axle & other fancy stuff. "The Honker" (Size, not behavior )
* 2007 Excel Limited 33RSE