Welcome to the forum. I have had to address a few of the things you are talking about doing. You can also take a look at my “pictures and albums “ for other modifications I have done.
I think the best way to address the fresh water problems with the TM is the Bridge. Take a look at post #25.
http://www.trailmanorowners.com/foru...t=10458&page=3
For sewer hose the fence post solution works for me. Mine is like post #17
http://trailmanorowners.com/forum/sh...?t=9973&page=2
For the shower plastic on the walls and hand free soap dispenser for the shower head makes all the difference in the world.
http://www.trailmanorowners.com/foru...ead.php?t=3223
http://trailmanorowners.com/forum/showthread.php?t=7812
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Roger and Patty 
TM:2006 2720SL
TV: 2010 Tundra w/ tow pac.
Dealer Options:swing tongue, sink cabinet, awning, air conditioning, tile
Modification: 15“ tires & monitor system, WDH, Prodigy B.C., 2-6 V. batteries & clipper monitor, LED's. Additional modifications can be seen in albums.
Pictures of campsites and places we visited can be seen at https://www.flickr.com/photos/101899116@N06/sets/.
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