I have always gone with the saying better safe than sorry. I am reasonably sure I could get by without the WDH, but if two years down the road I start seeing my rear suspension sagging I would regret it.
I highly recommend TPMS. You can ride down the road knowing you don’t have a slow leak that you won’t be aware of until the tire blows. It is kind of interesting to see what is going on with tire temperature and its effect on pressure going down the road. I am not positive but I think this should also give you early warning to a bearing going out. For me the peace of mind of not having to worry about an undetected tire problem is well worth the price. When we had our blowout the alarm worked flawlessly.
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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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