2006 LBZ Duramax 4x4. Brand new flat bed, arp head studs, injectors done around 190k miles, Allison transmission, deleted and tuned with EFI Live 5 position switch, 6" exhaust with 8" turn down, 6 brand new tires less than 6 months ago. Needs nothing, just drove it to Florida in March. Zero blow by or haze. Can tow any kind of trailer, gooseneck, 5th wheel or bumper. 18k lbs 5th wheel hitch comes with it. 278,000 miles and still running strong.