I am looking for opinions about replacement tires for my trailer. Specificly trailer tires vs. regular vehicle tires. I keep getting told to NOT use car tires due to sidewall strength. My trailer is a 13 footer and will weight in, loaded, far less than a vehicle. I would get very good quality tires either way, but can I use regular tires? I see a lot of car tires used and never hear of any problems. Suggestions?