tre5
+1y
Looks like the rear bars are the perfect distance from the frame to center the bag on the bar. I am not sure though. Also, the longer you can make the dog bone the better. I have never done one shorter than 5". You obviously want to mount the pivot as high as you can off the back of the axle, so that you keep the lower point off the ground as far as possible as well. But saying that it shouldn't be longer than 4" is a dumb comment to make. That's like saying your 4 link bars shouldn't be longer than 24" because that's a generic size. Build the suspension around the truck... not around the generic parts that are available!