Ladder Bar question

So I've bee studying the chassis book by Dave,As far as ladder bars go,When you make adjustment in the front pivot which is your c/l on ladder bars you use the two rear adjusters on the axle side to reset pinion angle????? am I correct on this???? also he talks of pre-load and I'm understanding if you can you run without it but if you need it (on the drivers side) you also lower the front eyelet by the rear axle adjusters but if you do that how do you set pinion angle then,That's the only thing I'm getting screwed up on otherwise I'm starting to understand this book more and more but it takes a lot of patience and reread reread reread at least for me--Thanks guy's-Steve