I really want to get the new BFGoodrich All-Terrain KO2s, but they’re about $860 for LT275/70R18. I have the money, but I’d like to offset the cost by selling the tires I have now, which are National Commandos in LT275/65R18 (also worth noting is that they have at least 75% tread left). So does anybody have any experience doing this? Is there a website I can go to (besides Craigslist) or do I have to sell them to a shady tire shop?