Having just upgraded to a 2500 4x4 from a 1500 4x4, I need to lift my 2000 Jayco 5'er. My bed sits @ 3" higher than my old truck did. I looked under the trailer and the shackle's have three holes in them. The leaf springs are currently bolted thru the upper holes. I think I can get all the lift I need by simply unbolting the springs and moving them to the lower holes - also checking the brake lines for length. Am I correct on this - it wont sacrifice anything? I cant imagine that they'd put shackles such as that on if they weren't intended to be used... ... .