Without an actual weight on the front axle, preferably by tire, it would be difficult to determine to correct pressure to run. Typically, unless weights by tire position, or at least by axle, are know, following the manufacturer's recommendation on tire pressures is the best bet.
The pressures I run are Newell's recommended pressures for my coach.
You can get tire pressure charts from most tire manufacturers that give the weight that each model and size of tire will carry at various pressures. I prefer to have a tire slightly overinflated than to have them underinflated.
Don't inflate a cold tire to a pressure greater than the pressure marked on the tire as the maximum inflation pressure or to a greater pressure than the rating on the wheel.
I have had a couple of Goodyear tires come apart on Airstream trailers but I have no personal experience with them on Newells.
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