The vehicle mfg specified pressure of 35 psi is based on the vehicle axles being at their specified GVWR's. The tire mfgs specified pressure of 44 psi is based on the max weight the tire is designed to carry (also specified on the side wall) and this would be at or above the axle max weight.
Unless you have some suspicion that the vehicle mfg has specified too low a tire pressure for comfort vs actual load carrying capacity, (as in the Ford Explorer debacle of a few years back) you should use the vehicle mfg specified pressure.
This is all based on the tires installed on your vehicle being the same size, type, load range, etc, as the ones originally installed. If you have installed a different size, a different type P vs LT for example, or different load range, then the vehicle manufacturers pressures are meaningless, but the sidewall max is equally meaningless. You would need to consult a tire mfg load/pressure chart to get an accurate pressure.
Charles
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'03 Ram 2500 CTD, 5.9HO PacBrake six speed std cab long bed Leer top and 2008 Bigfoot 25B21RB.. Previously, 2008 Thor Freedom Spirit 180, SOLD! 2007 Winnebago View 23H Motorhome, SOLD!
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