I've run many used tires,in fact Ibet I have bought only one brand new set of 4 tires ,many moons ago--Cooper bias ply Discoverer's ,8.75x16.5's,for my 72 K5......I usually scour the salvage yards for good take offs,or better yet,look in the trunks or under the truck beds for never used spares!..they sell them for 15-25 bucks a whack at most yards here.......................................................................................................I feel its a waste of money buying new,especially at todays prices..not when I can score unused spares or like new ones for used prices................................................................................................If I was driving hundreds of miles weekly,that would be different..on my vehicles that sit more than they get used,it would be a real waste of cash watching new tires flat spot and crack.................................................................................................I haven't bothered looking at date codes,so far I've had no problems just looking at the sidewalls for cracks when folding them back--if they look good,I run them..............I think maybe 2-3 tires I had failed,and only one from "old age",the tread separated all the way around the shoulder,and flew off in one peice on one radial I had years ago....the 265/75/16" Goodyear Wranglers on my pickup now I got from a friend--they sat behind his shop after his brother gave them to his dad in 2007,who sadly passed away before he got to put them on his pickup...they still have zero cracks and look soft and flexible,not all petrified,have about 1/2 their original tread...had about 30K on them...my truck rides a lot better with these load range C tires compared to the Steeltex Firestone ones that were load range E too....