Constantly supplying antifreeze all winter instead of heat?

I* am thinking most RV parks, in fact I think just about all of them, have showers you can use.. In fact due to physical size in most RV parks I prefer to use the "Park" showers (bigger than the telephone booth in the RV) Last park I was in I used the RV's cause.. Well, parks were also Telephone booths and mine has a "Telephone" type shower head (Hand held) the park's did not.