Maybe it's just me, but I only use 3 gallons of RV anti-freeze to completely winterize each year, at a cost of less than $10. And as the faucets already drain into the sinks, the pink stuff already fills the traps. So I would have to catch the RV anti-freeze in a container, then go back and put another liquid in the traps. For my time and money, that little bit of anti-freeze is of little consequence.
But hey! If you want to be frugal, more power to ya! Others may think it's a good idea, and that's why this site exists.
2015 Jay Flight 32RLDS Elite
2012 Chevy 2500HD Crew Cab LTZ (6.6L Duramax/Allison)
Equalizer Hitch (1200# bars)