When both truck and trailer are sitting level and disconnected How much difference in ball height and coupler height is there? You may need the ball raised or lowered so these are similar.
Once they are close, You can add/remove spacers or raise/lower the L-brackets to adjust and fine tune the amount of weight being transferred. Be careful not to over adjust and raise the TV height above the unloaded height.
The Trunnion bars should be roughly parallel to the frame when all is properly adjusted. They may be slightly higher or lower but This can be adjusted by using spacers on the spacer rivet or changing holes for the L-brackets.
The manual for the hitch works through this very well.
http://www.fastwaytrailer.com/wp-content/uploads/2014/04/e2_trunnion_instructions_0212.pdf
I adjusted my hitch so the ball and coupler are similar height and have all the WD adjustment needed. I rarely have to raise the coupler more than an inch or two and can set my bars without tools. Makes it so much easier than having to raise the jack so high and then use the tool to get the bars on.