Keep a separate drawbar just for farm implements. Maybe also have separate ones for each size of hitch ball. It would also be easier to loosen that nut if you take the whole drawbar out of the receiver and rotated it 90 degrees counterclockwise put it back in then when you put the wrench on the nut just jump up and down on the wrench and it should come loose easier. Also put the wrench handles very close together but facing opposite directions with the lower wrench slightly to the right of the upper wrench and use your arms to move those pushing them closer together and not using your body weight. If you get the wrenches close enough you can wrap both hands around both wrenches and squeeze them together to loosen it.

I know that everyone has already told you about using a cheater pipe for leverage, but another tip for you is to pull the hitch out and put it back in so that the hitch and ball are sitting sideways then you can pull up lifting the wrench, you can lift more than you can push! Or you can jump up and down on the wrench or kick it while standing. And then for tightening the ball just put the hitch in sideways again but the opposite way.

If your times as valuable as you've said before an extra drop hitch for each hookup is well worth the money. Threads are easy to strip on the balls as well. Much easier to pull a cotter pin and replace the whole hitch, about ten seconds total.

Aww, this young lady works harder than most men! She is pretty strong too as she was moving the whole truck a few times! My shoulders and back hurt from watching though. I hope she gets a back rub from her hubby, she deserves it!