In short we welded a 3" X 1/4" angle to the bottom lip of the old axle mounts (I.e. The bottom of the frame ) and then used a square to mark the slots for the axle.
There is a bolt on kit available to raise two inches for a couple hundred bucks.
I went the way I went for two reasons, one it was cheaper, I already had thirteen feet of angle, and two because I was able to remove a pretty good bit of frame sag by jacking the trailer from the rear and welding in the angle.
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