I haven't towed barely at all this year other than bringing it home from Illinois, after that maybe 20 miles. I don't know how much it was towed by the original owner though. However, I had no warning signs at all, at least no obvious ones. Last weekend I towed it to the gas station and back no problem, this weekend the tires were jammed up into the fenders before I even moved it.
My neighbor has his empty for sale Supra Boatmate dual axle trailer sitting literally 15 feet from my boat on a broken trailer...maybe it's time to upgrade to a dual, even though I only tow a couple times a year for very short rides!