I realize that extended shackles are cheap, and really the only option these days. The deal with shackles is that you need twice the length for 1/2 the lift....2" of lift requires 4" longer shackles, for example. Well, what about a new leaf pack that will provide the lift? Those longer shackles seem to be in harms way on departure angle. Are there any options for rear leafs? Is custom the only option?