To answer your question about ball height:
This from the set up manual that came with the hitch.
Level the trailer and then measure the coupler height. Install the hitch head onto the receiver
shank, using the 3/4”-10 bolts, 3/4” lock washers and 3/4”-10 hex nuts. Measure the hitch head
ball height. The ball height needs to be the same or 1” higher than the trailer coupler height,The ball height needs to be the same or 1” higher than the trailer coupler height, adjust as necessary.
I make mine 1 inch higher...and it tows perfectly when trip ready and loaded.