I only use Goodyear Marathons although they are now made in China, but radials have less rolling resistance and have a softer ride.
If you have a 3,500 LB rated single axle, you may consider upgrading it to a 5,000 axle.
With your tires rearing on the inside, you may have an overloaded axle.
What is the correct pressure for your tires, should be marked on the tires.