Maggie said:
"I'm curious if there is something to put in my water holding tank to
keep it from freezing? Or should I just drain it for the winter?"

I camp year-round too so I just drain it well, let it air out on the return
trip by leaving the drain cap off the tank while driving home. I have used
everclear in it a couple times to be sure it has no "bugs". When I've done
that I filled the tank almost full, put the pint of everclear in, ran the
faucet pump to fill that line, left the system "charged" for a few days,
then drained everything. Pretty easy to flush that out by rinsing the inside
of the tank with the hose, then running the faucet a little. I've never
noticed an alcohol taste after that process, but have only done it a couple
times in all the years I've owned a Westy.
my $0.02...
Bob Stevens
'87 Westy Syncro
"Passion Fruit"