Winterizing my daughter's 2019 Outdoors RV 21KVS trailer using compressed air. Fortunately we live where it seldom gets much below freezing, so we don't fill the entire plumbing with RV antifreeze and instead blow out the water lines with compressed air.

The video also mentions some of the tools you'll need, including:
* Air compressor set to no more than 60psi
* Garden hose/compressor adapter to connect to City Water Fill
* Camco water heater flush wand
* 1 1/16 inch deep socket to remove water heater anode rod
* Replacement anode rod (if needed)
* RV antifreeze for drain traps & toilet