Leveling Hint...
Once you have the trailer hooked up (and depending on the weight)...
Leave the hitch locked onto the ball,
Lower the trailer's lift jack so that it releaves the pressure on the horizontal pin that holds the ball assembly to the gear-type flat plate (with the receiver tube welded to the reverse side),
Remove the horizontal pin,
Again, use the trailer jack to lift or lower the entire ball assembly up or down on the on the flat gear-type flat plate.
Once you have it at the desired height, replace the horizontal pin and you're done. No need to keep backing on and off the trailer and remove the trailer from the ball over and over just to raise or lower the anchor point a bit.
Slick and easy.
Enjoy!