After reading a few posts on here I decided to replace the drain hose that was crumbling due to the sun cooking it. After trying to figure out how to even reach it I noticed that there was plenty of "slack" in the hose but it was tied in a knot and smashed in the coils! There was no way this was draining anything. After fishing it out the hose is better than 2 feet long with plenty to spare to cut off the bad part. This might be something you should look at on yours...
2001 GMC 2500HD 4x4 with 8.1 gas Allison trans
2011 Coachman Chaparral 268RLE "Campy"
That appears to be something that should have been trimmed to the proper length when the refer was installed in the trailer. Maybe the guy with the scissors was on break at the time.
Rich and Joyce
2010 HiLo 2310H
2012 Ford F150 4X4 Supercrew EcoBoost
Reese Strait-Line Dual Cam Hitch Amateur Radio K3EXU