so your riding in sand? i asume you could fuck with the geomitry of the chassis and still be able to dune on it, but if the shocks not pitched right youll either pogo like a son of a bitch in any terrain or the ass end will fishtail kinda like it had no shock at all, so youd loose shitloads of traction, maybe just copy the rake on the stocker and extend that 4 inches, thats probally all the after market guys do....gary at qiucksand would tell ya, he's a member of the HQ.....post pics of what you come up, ive shortened a few but never extended one.....good luck man