Well, I'll throw in my $.02.
I just Hauled a 450 Diesel Farmall through Tennesse, Kentucky, Ohio, in to southern MI where I live. '97 K2500 Chevy with 6.5 diesel. I estimate tractor weighed 7,000 lbs anyway, on a bumper pull equipment trailer. Truck handeled it just fine (I'm pretty sure I was actually legal), Ran out of power on I-75 in the mountians. I know, you don't have an antique underpowered diesel, I'm just saying. By the way, once I fixed the vacuum setup for my turbo at an exit, it pulled better. Still low on power in a few spots, though. If anybody was behind me at 35 mph on I-75, sorry!
I will say this... Here In Michigan, I've heard that the D.O.T. will now pull over private guys and weigh axles like the big trucks. You'll difinetly not be legal with that big tractor. Can your truck handle it? It may very well. If some pain in the butt Weighmaster pulls you over? You'll have a big ticket to ride home with. (without your tractor in tow, at best)
Take care, Andy