I use a 3pt trailer hitch attachment a lot - one thing you need to be aware of when using it:
Since your 3 point hitch cannot apply down force, any tendency of the trailer tongue to lift will not be resisted.
This may sound trivial, but if you happen to be backing up while making a turn and the rear of your trailer should happen to start digging into a snowbank, the rear of the trailer will squat down, lifting the tongue & 3pt until the 3pt runs out of travel.
At this point the tractor will be in a very in-ter-est-ing equilibrium state, but only for an instant.
The various forces in play, to wit, traction, power, resistance of the trailer to roll back further, angle of the trailer to the tractor, both as viewed from above & from the side, center of gravity of the trailer and of the tractor, travel speed, all of these will all act in concert with the speed and judgment of the operator's brain to determine if the trailer jackknifes into the tractor, or continues to lift and push the tractor over onto it's side. Don't ask how I know this.
Another scenario: you are hauling firewood out of the woods. It has been cut to 16" length & you are bringing it to an area where you do the splitting. You start up a steep incline & the round logettes roll to the back of the trailer, lifting the tongue and removing some of the weight from the rear axle - not a lot, just enough to lose traction, and if you happen to have forgotten to put the tractor in 4wd, you suddenly realize that you have lost your braking ability. I leave the outcome of this scenario to your imagination. Again, please don't ask.
For the reasons listed, I have learned to:
1) Secure the 3 point hitch to the fixed drawbar, using the method shown, to ensure that the tongue cannot lift beyond where I think it should, whenever using the tractor to move a trailer:
View attachment 416523
2) Secure the load to the trailer to ensure that the CG cannot move to a location aft of the rear axle.
-Jim