Dent in tire

[nofearengineer]

Guys, I am looking at a used spare tire for my trailer. I actually found the same tire (Goodyear Marathon ST 215/75 R14) on the same chrome directional wheel I use.

However, it has a "line" across the sidewall, where it was probably lying over against a hard edge of something for a while. It isn't a cut or a gouge; there is no missing material whatsoever. The line is maybe 3/32" deep, and about 3-4 in. long. The reason I think it was lying against something is the line continues across the other side of the wheel, much less deep, but still a trace of it.

I am wondering if this line would come out of the tire once it warms up, I might leave it out in the sun for a few hours and see what happens.

I hear the strength of the tire sidewall is from the belts and cords; the rubber is just there to hold it together. That being said, I still wouldn't use a tire with holes or cuts in it. This is just a little more subtle, and the price is right, so I'd appreciate your thoughts.