Climate permitting, these are wonderful gadgets ...
A simple arrangement of S-hooks and a couple low-rent pulleys (think, poor mans block-and-tackle) makes raising it overhead easy. If you have ladder, just set flat on roof in the AM ... hot by afternoon.
Also, if you consider using degradable soaps etc. no reason you couldn't consider dumping your GREY water if locale / environment is tolerant of such. An improvised dry well might be another option for grey disposal.
We carry separate fresh water (gallons from store) for coffee / drinking / cooking so those uses don't impact our water tank capacity. We also schlep along a couple of the big six gallon plastic jugs to stretch things further.
Jeff and Abby
Fur Babies - Xandra Sophia (GSD) and Neo (Min-Pin Mutt who thinks he is a cat)
2015 Tracer Air 235 (previous 1994 Veri-Lite 1130 TC)
1998 Dodge Ram 2500 Quad Cab - 360 - 46RE (Built)