Dude; spring for the 3/4 ton. Transmission is where the major difference is. 4L60 vs. 4L80, at least in the late 90's. Call a tranny shop and tell them what you are planning to pull. If ya go 1/2 ton you will be seeing them soon. Brakes, yeah the trailer should handle itself. What about if they malfunction or overheat? Your front end will look much better if you were driving the 3/4-ton. I tow 5600 with a Tahoe and it does ok but the 3/4 ton is where its at. If you insist on the Tahoe get the air bags and upgrade the tires to ones that carry 50 psi or better. JC whitney sells replacement rotors that are cross drilled and stay cooler.