OK so here we go again. I have 5 years on my trailer tires. I know many have said replace the tires at this point. There is no cracking on the side tire walls. We travel small distances, maybe two hou...
Truth is, you could change them today and have a blowout tomorrow. Like someone said, it is up to your risk tolerance.
If it was me, and I had a long trip coming, I would change them. If all I was doing is local short trips, i would keep them and monitor closely.
Mine were off brand, never covered (in Texas), four years old, had surface cracks, and one got a bubble. So I changed them all. Sounds like yours are name brand, better cared for, and in better shape.