I would be careful using that hitch as it puts the ball rearward a long ways from the rear axle. Really think you would be better off with the hitch ball much closer in to the machine.
If you are using this to move and park trailers, moving just a short distance the front weight bracket has a 1 1/4" receiver built in. This will handle more weight than you can deal with on the rear ball as you have it configured now.
Go slow while backing a trailer for the first time as the 4ws will over steer a trailer very quickly. The 4ws also has the effect of not making much difference which end is hooked to a trailer, reacts the same either end.