[hankaye]

JRB, Howdy;

Agree about getting rid of the bales... nothing but problems...
Instead, I've used pieces of OSB or plywood, painted for
weatherproofing also, measure the distance between TT's bottom and
Ground to see what is average height and work from that. I attached them
to the underside of the trailer (worked very well for me in Central Utah with
temps. to -40*F).
Heat tape for the water hose with the foam tube insulation works very well.
Looking at the forecast, you should be ok with the gray tank either open or
closed, your choice, daytime temps should allow for enough thawing
provided the waste hose is in sunlight.
During the day when the temps get higher is a good time for the elect. heat.
After the sun goes down best to stay with the TT's heater as it should
provide some protection for the plumbing.
I am connected to a 125# propane tank and they last (depending on how
the thermostat is set, how much hot water is used, how cold it is yadda yadda)
a month or more and they come to you instead of trying to find an open propane
place in the middle of the night.
Keeping cabinets and other access points to plumbing open so the warm air can
get in there is a great tip and one I use every winter.
Lots of excellent tips throughout this thread...
Use your common sense and it should all work out for you.

hankaye