Hard to believe the big deal made about towing weight at low speeds. The frame and engine will certainly handle it, and 4 wheel LOW will do some amazing things. I hooked my Z71 5.3 sierra to a 70 foot downed pine tree laying flat, via a logging chain and my reciever from walmart. Yanked it and on the third jolt I got her rolling in four wheel low and moved the sucka around to a new location in the yard with no ill effect. You may say nay, but I'll never forget my victory dance, and I popped a top on a cold one, and enjoyed the look on my uncles face.(I love 4 wheel LOW)
My uncle tows a CASE(think it weighs 6 tons????) backhoe and a gooseneck with trailer brakes with his 87 3/4 ton dodge at highway speeds, and its just a 318 with a 200xxx mile 727 tranny. Been doin it for years.
I have towed well over 8000 pounds with an 87 1/2 ton ext cab F150 (300 I6/4speed)and it wouldn't stop on a dime, but I compensated accordingly.