Winterizing

Quick question...
I follow a few CC trailer conv groups on FB and there are several posts about winterizing, pouring RV antifreeze into the water supply lines etc and drains.
Now my thoughts are that in a fairly basic plumbing drain system in a CC the only things that should have water would be P traps or S traps under any sink or shower which usually have a twist off plug to drain. all other draining would be at a slight pitch anyways to any blk, gry tank etc. so ity seems to be easily drained with just gravity.
I do lawn care and the other day I saw a crew blowing out lawn sprinkler systems with a big compressor until all the lines were dry. Has anyone installed a air line quick connect to blow out their supply lines to avoid filling with RV antifreeze??
I follow a few CC trailer conv groups on FB and there are several posts about winterizing, pouring RV antifreeze into the water supply lines etc and drains.
Now my thoughts are that in a fairly basic plumbing drain system in a CC the only things that should have water would be P traps or S traps under any sink or shower which usually have a twist off plug to drain. all other draining would be at a slight pitch anyways to any blk, gry tank etc. so ity seems to be easily drained with just gravity.
I do lawn care and the other day I saw a crew blowing out lawn sprinkler systems with a big compressor until all the lines were dry. Has anyone installed a air line quick connect to blow out their supply lines to avoid filling with RV antifreeze??