You'll be illegal in most states towing it like that. The max you can tow without trailer brakes is 3000 lbs. The Blazer I flat towed was missing a bunch of parts including the motor, bumpers plus a lot of interior stuff was missing too. Even so mine weighed in at 3400 lbs.
My 81 Jimmy had no trouble towing it, most of the time I'd forget it was behind me until I checked the mirror. It did surprise me a few times, one time in particular getting onto the I-35 in witchita...the road was wet and the towed Blazer did a nice job pushing the back end of my Jimmy around. That was just enough to illustrate to me that I did need to be a bit more careful. Tight corners can be interesting...backing up is impossible.
I custom built my tow bar so it bolted up in between the frame rails rather than clamped to a factory bumper. Even so, I'd reccomend renting either a dolly with brakes or a full out car trailer. It'll be a much less stressful drive, and it'll be legal.
I got nailed as soon as I crossed back into Canada and had to have the Blazer towed by a tow truck the last 12 miles of the trip. /forums/images/graemlins/rolleyes.gif
Rene