Don't over think it. Gauges, intake, exhaust, gearhead tunes. My '02 pmr truck had 283k on it when I sold it, toasted rear ujoints pulling some wicked hills, and trans started acting funny at 240k. Truck was lifted, lowered, leveled, different heughts, different sized tires, all with the same mods, and heavy towing. It drug 27k gross across i-10, and up to vegas to carroll shelbys birthday bash flawlesly, and I don't tow slowly...minimum 70mph, it grossed 32k a couple times, and did what I asked of it. Great truck. I bought the one in my sig on a whim, smokin deal, gave it a once over in the p.o's driveway, and handed over the cash. It's been a great little truck, 17.8mpg hand calculated mixed driving, 38 gallon rear tank, so highway trips get long winded lol. Check fluids, blowby, drive it...if all seems good, buy it.