I was supposed to leave Saturday, but thats another story. Anyway, when I can actually go, I have a question. First off, I have a 1990 Full Size,350tbi, 700r4, 4x4, 3.08, running factory size 31 10.5 15 tires, reese class 3 hitch. I will hopefully be pulling a uhaul auto transport, empty weight 2,210lbs, carrying a 1984 AMC Eagle Sedan about, with an empty gas tank ~3100lbs. The trip is ~640 miles, until I can unload the Eagle at my sister's house, and drop off the trailer. Is this setup going to be okay? How about going uphill, and over mountains (and of course back down)? I have towed short distances on flat ground before, but not with the blazer.

If this setup is a bad idea, how about a tow dolly, 750lbs, and dropping the driveshaft on the AMC?

 

Your suspension can handle that much weight easily. Your brakes will be overworked unless the trailer has hydraulic brakes, so you will want to check on that. If the trailer has electric brakes you will need to install a controller. The tranny will do the job but will get a bit warm. Best thing to do is add an aux tranny cooler. The engine won't have a problem.

This all being said assuming your Blazer is in good mechanical shape with no current problems.

 

The trailer will not have electronic brakes. Some models, however have an emergency brake, activated with a third chain (separate from the safety chains).

 

If the trailer has a break away switch then it has electric brakes. Electric brakes are required by law. If you were to have an incident you could be held at fault if your trailer brakes aren't hooked up or working. To think it through a little further if some was killed you could be held on manslaughter charges.

 

I will be towing on one of these. U-Haul Transport, with an 1984 AMC Eagle on top of it.

 

The trailer comes with hydraulic brakes, according to the link you posted. You'll be good to go as far as brakes go.