" less in small increments not go below about 110-115 psi"
Where do you come up with this?
NOT all DRV's need 125psi to properly carry the load.
Directly from GY Tech if using the weight/inflation chart weigh each tire look up the proper inflation and add 5psi.
I had the 17'5's on my 36' 07.5 DRV and ran 110psi with perfect tire wear.
Proper inflation based on load gives better ride, better stopping power and better tread wear.
On current DRV I run 125psi because I have nearly 18K setting on my 4 tires. Triple axle units most likely do not need MAX inflation.
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