We have been showering a lot in the desert here and so far
we have 'evolved' to a "Solar Shower" bag (that we have to
put hot water into), hang it off the rear of the van's pop
top (so as not to make a mess in front of the sliding
door).  We take turns operating the shower for the other (to
conserve water).

For more privacy, we may get nylon cloth to hang from the
rear hatch to make a shower stall, utilizing the rear screen
snaps into the design (to keep water out of the rear of the
van).

So far, the black "Solar Shower" bag has been a
disappointment,  we'll keep using it, but it does not warm
up much, especially if we wait till the sun goes down to
shower.

I think my next "mod" will be to get a second Westy
submergible pump, run some electrical wires to the rear of
the van and put in a toggle type switch.  That way I can
just drop the submergible pump  into any 'gerry" can and
pump water for a shower.  Simple.  Malcolm