I just took delivery of a new Jay Feather today. Here in PA we've been as low as the mid-teens in the last couple of weeks, so there was no way we could include testing the fresh water system in the PDI. However, the dealer did test it in advance and winterized the entire system for me with antifreeze. No leaks. I looked.
If your dealer would do that, then you could travel that way until you reach warmer climates, then drain and sanitize before you hook up at your destination.