So I am looking to buy goodyear 445/65r22.5 tires for my truck and I have found a set of 4. That being said, 2 tires are perfect and have 30/32 tread all around. The other 2 have 30/32 all around except in one area about a foot long that goes the width of the tire where the tread is 25/32.

Which is about 1/8 of an inch different. Is this something to be concerned about or should I just go ahead and buy them.
2 perfect tires are 500 a piece and the other two are 300. These are normally 1200 new so that is why I want them. Also I only drive the truck at most 5000 miles a year and it weighs 15000 pounds if that makes any difference...