According to my older service manual, the 3 pt capacity at the pins is 2865 lbs. I'm sure the drawbar would be rated for a bit more than that and should cover virtually any tongue weight you would encounter.
After hurricanes Francis and Jeanne in 2004, I put a 2 5/16" ball on my 3 pt drawbar and moved many doublewide trailers onto lots in Florida. I moved quite a few 12'x52' sections. It was all my 3 pt would do to pick the tongue weight up and I had to go very slow moving them as my front wheels were off the ground alot. Had to keep a small load in the bucket to keep some steering. I was told that those doublewide halves weigh as much as 35,000 lbs. and tongue weights were around 3,000 lbs (+/-). If my 3 pt held those, I'm sure the fixed drawbar would easily handle up to those loads. As far as the tractor pulling the load, I think you could probably pull a house on axles with these tractors !! Those doublewides were terribly hard to maneuver in that sand, had to lay plywood down in most cases under the trailer wheels, they kept sinking and plowing - that was the only thing that stopped my tractor when those tires sunk more than 3 or 4 inches. You've got to remember about stopping though - be sure to keep it in 4x4 if you have any hill at all, this will give your front wheels some brakes. A heavy trailer will shove your tractor very easily, I know first hand. Lost my favorite water jug sliding down a friend's gravel driveway with my empty equip. trailer behind me - it's only 3k lbs. My jug fell off when I started bouncing around a little and the rear tire went right over it, squashed it like a ripe tomato. That could have been me.