I would recommend the largest all cast Hi-lift jack made (60" IIRC). Also while a stock bumper isn't ideal for using a Hi-lift on Hi-lift does have a special adapter for use with stock bumpers.
http://www.hi-lift.com/accessories/bumper-lift.html
The biggest thing I can't stress enough on is about the intended use of a Hi-lift jack. Hi-lift jacks
ARE NOT meant to be used for changing tires and the like, they are designed to be used to get a stuck vehicle unstuck by jacking the vehicle up and then pushing it off the jack allowing the vehicle to move forward. The base is attached the the beam of the jack with a single cotter pin.