the farther back it is, the higher it will lift plus the greater clearance you have for jackknifing in tight quarters when those situations arise.
if you get one of these tire racks:
http://www.ebay.com/itm/Tie-Down-Gal...MAAOSwFTRTrFpV
you can mount it to the which post and not have to move the jack at all as far as making room for the tire goes