Good summary Steve. With recommended pressure of 100 psi or less, there is not a need the pressure doubler but for those with heavier coaches it is almost necessary. Back in the early 1980's it was not uncommon for the rear tires to require higher pressure than the front tires since the coaches did not have tag axles. At that time front axles were rated at about 12,000 pounds. By the late 1980's front axle weight ratings were 13,200 pounds. By the mid 1990's the front axle was rated at 14,000 pounds. With the advent of slides the front axles were rated at 17,640 pounds. This was increased to 18,180 with the P2000i and to 18,700 pounds by 2009.
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