I actually managed about 40K miles on the RT/S, but between 30 and 40 they just went shamelessly bald. I mean they were put on when the trac was new, never balanced properly, or went out of balance within a week, and looked good at 10K, 20K, and 30K miles... then around 35K they just went bald. Like overnight. I lost like 5mm of tread per day until they melted at around 40K miles (note: measurements are not exact, it may have been more than 5mm.) I'm not kidding, one of them melted, there was no hole, there was no detachment from the wheel, it just liquified and turned into black goo at 88MPH. (Okay, I think a belt shifted, but it looked like it melted, it's still a crappy tire, and melting sounds better than tread separation, belt shift, etc... try it, say "I had tread separation" you'll get this from your audience: "Oh, is that like gonorrhea?". Say "My tires melted" and they will say "Ohhhh, sweet, got pics.")
There's that and that when I bought the trac, it had Firestones (forresters, mud humpers, tree climbers, bear pavers.. I forget what model they were) on it which looked awesome and handled really nice. Then my dealer (brother-in-law) forced me back to get the recall done before I became dead and he'd never hear the end of it.
Well the goodyears looked like $h!t but they were free and "safe", at least not subject to NTHSB.. NTSA.. NASA.. NHTSAB, (whatever) scrutiny.
For 40K miles I had the "it's a truck, it's supposed to ride like $h!t and I love it" syndrome, then that blessed day where the tire melted came and I thought my engine seized, or the trac farted or something, and pulled over. I immediately phoned my tire dealer who was on speed dial for this momentous event and proclaimed "get me 4 new Pirelli Scorpion STRa tires, I saw a really cool review for them and they were made by italian robots that immigrated to the US, and do not stick icepicks in air bubbles in tires, or generally F up otherwise unless they were programmed to do so."
Once I saw how well better tires made the ride, I questioned the credibility of the alleged "shocks" that Ford put on the sport trac, and ever since then have been all over my suspension like Martha Stewart on a fuzzy sweater.
edit: Firestone Wilderness AT, that's what they were, they looked awesome.