Depends on the brand of RV antifreeze one uses.., some have corrosion inhibitors and aren't designed for long-term use, thus the RV antifreeze should be flushed out of the system annually.
As I recall, RV anti-freeze has a shelf life of a couple years.
For long term storage I would use air pressure to flush the system in lieu of anti-freeze.
2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (integrated sway control)