Another thought. Find out the maximum load for the tire. Each tire will be carrying, if the load is evenly distributed, half of the axle load.
Weigh the vehicle while loaded.
The weight on my rear axle is approximately 3,400 pounds when the is no cargo and no trailer. I would need P tires rated for 1,700 pounds. I don't think P tires will carry that load.
P tires are fine for an SUV used exclusively as a passenger car. My wife's Lexus SUV has P tires on it, but I would never use to tow anything.
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