I have two trailers, one 24 Ft Pace Shadow car trailer that has a car in it year round with the weight on the tires, my 34 Ft fifth wheel travel trailer weighs around 3000 lbs. more empty than the car traier does with any of my car sitting in it. They both set in the driveway year round on the tires, I should really cover the tires up to avoid dry rot from the sun but I haven't yet, the car trailer tires are going on 5 years old now. I have blown several of the car trailer tires out in the past that had less than three years use on them, they where 725x75x15 inch, I think, load range D 15 inch trailer tires, I buy load range E trailer tires now