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I don't know all of the mathematics involved with figuring the best place to mount the ball, but That would not be my choice of where to put it!
Unless you enjoy doing wheelie's.
With the weight he already has before the axle of the truck and depending on the hitch weight when loaded along with the proper placement and number of the trailer axles (unseen in photo), I'd say "he could probably pull that off". Pun intended.
With that little lincoln ranger weighing in at about 350# and the rig bed hitting maybe 2k# depending on deck thickness... he doesnt have much of a ballast in front of that axle.
He could obviously pull the trailer... but this would be one of those instances where balancing weight on the trailer is critical. I sure as hell wouldnt do it...
But then again...
I talked to some guys about this and apparently its pretty common. What they do is they put the heavy welding equipment in front of the axle, and move the GN ball to the rear of the axle. Combined this evens out the load and distributes the weight evenly over the rear axle, sort of like having a really heavy pin weight.