Running at 55 you would certainly be safe. I recently found mine out of adjustment and reading just under 100, so the system could probably handle more. If your pressure is still a little low I wouldn't be afraid of having it set at 60.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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