I have Toyo 37s on my 4-door. 32psi Front, 30psi rear - Cold. Not a harsh ride at all. Other riders have commented on how smooth the truck is.
Even at this low tire pressure the E-Rated tire still has more than enough tire pressure to handle the Bronco's weight. There is minimal tire bulge and a nice Flat tire patch.
That's not low pressure for 37s. In general, the larger the tire, the lower the pressure to support the same weight. You can go down to 26-28psi and still be over the weight rating for the Bronco, unless you are really loaded down.
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