I bought a used trailer a couple weeks ago, it needed new tires. Well today I got new tires, had them installed by a guy here in town, who has a tire machine. I am just wondering what I should run the tires at. It is a Load Trail 10k lb. trailer, tires are 225/75-15, not sure on the load range. Do I go off of the sidewall rating for it? Any help is appreciated.