I've searched, here are some questions: 1) guidelines for bumpstop to spring distance for 4" front 48" springs and stock rear 52" springs. I'm looking to keep them from going into negative arch. ORD suggested 3". 2) guidelines for positive stop. E.g metal to metal contact. Same as #1. Guess the answer here is to ramp and test for interference in addition to limiting spring compression. 3) 4.5" extended bump stop compression limits. I've heard that they can only go 2.25" on compression before risking breakage. Some articles out there have recommended fabricating positive stops to limit compression. one idea was to provide a female box section around the OD of the bumpstop 2.25" high. 4) Square tube bump stop spacers - cheap way to space down factory bumps. Any pics? Strong enough? Too much leverage on the frame?