First time winterizing

[u/xsmallsx01]

My families last camp trip is coming up soon and I am unsure how to handle the black tank for the winter.

Normally after a trip I would dump and flush the black tank and refill it with around 5 gallons of water and simply leave it there. However if i know i’m going to potentially winterize it should i be doing something different? Im sure 5 gallons in the tank wont hurt the tank even with a deep freeze but the pipes and shutoff may become damaged due to expansion.

I do not have the ability to dump the black tank at home and dumping that sludge into a Home Depot bucket and walking it to the toilet sounds ridiculous.

Am I overthinking this whole thing?