You have nothing to worry about, looking at the Pittsburgh forecast through beginning of December. Except maybe the garden hose freezing at night, which is easy to unhook and run off your tank.
If the temp is getting well above freezing during the day and only into the mid 20s at night, unless you literally have a camper water line that is totally exposed to the atmosphere, AND the daytime temps are staying below freezing.
Think about it this way. Takes a few hours to make ice cubes in a freezer and that is around 0 deg F.
Turn off your luggage lights, they won't add enough heat to do anything.
Don't bother draining gray and black. Again, a HUGE ice cube isn't going to freeze up unless it's below freezing for days. No AF needed in the P traps either.
If you don't believe me, take a bottle of ambient temp water, the first day it is getting below 32 at night, put it on the outside step and see how frozen it isn't the next morning.
Note, what I'm saying is not applicable to just leaving the camper for days unattended and hoping it doesn't get colder than forecasted.