I have used the Zodi unit for many years. It stores easily under the seat.
Heat it on the stove or our exterior portable propane stove. One charge is
enough for the morning shower/ hair washing ritual required for the civilized
survival of she-who-must-be-obeyed and our now 12 year old daughter. The Zodi
plus the 12 volt hair dryer, plastic shower stall from REI, and the wood
crate floor stand/soap and materials carrier (also from REI) are part of our
basic equipment.

Frank Grunthaner