My dad bought a 95 Tahoe new with 3.73s and the tow package, 350/4l60e and it had his 19 foot Grady on a tandem axle trailer behind it for the first 90k miles if its life. Normal "to the lake" weight was about 4500lbs, but every year we towed it from CT to NC, 14 hours in 100 degree July heat...