'heated garden hose'? what is that? Did you get a commercial hose or wind a heat tape around the hose? 28 not too bad, kind of depends on how long/sun on the hose next day/etc. Just heating the hose does nothing for the spigot piping or the connection at the trailer--all of that has to be protected. Many times, just inside the trailer wall is not insulated around the connection nor heated, and will freeze just inside the wall.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired