Bill is, of course, correct; however, that doesn't mean you can't install shut off valves and isolate specific sections of the plumbing to do exactly what you're describing. My Bigfoot 25RQ travel trailer has shut-off valves for the outside shower that, once winterized, can be shut off.whemme wrote: The Born Free's water lines are all interconnected with no bypass values (except for the water heater input and output lines) so there is no way to isolate various lines and use only some of the lines in the winter and keep pink antifreeze in other isolated and unused water lines.
It would certainly be a nuisance in the spring to de-winterize because you'd have several sets of valves to open, but it could certainly be done. My 23RK has fairly simple plumbing that is pretty much localized to the cabinet below the bathroom sink. I'd think that most of the Born Free coaches have a similar setup at the city water inlet/water tank location where the pump is, and the lines run from there.
Once you installed the shutoffs, you'd have to winterize the entire system properly with the valves open, then close the valves for all those areas you weren't planning on using, and then flush the parts you are planning to use with fresh water again.
Roger