Another option, for in the field use, is a Hi-lift jack (aka handy man jack.) I use them all the time around the farm and they work great for jacking up an axle on the tractor to change a tire. The only drawback is they are terribly dangerous and unpredictable. Still, probably the most used jack around our farm. Just have to be sure once you jack something up you immediately put a stand or blocking under it. Those hi-lift's have a nasty tendency to slide out from under what you are jacking up.:confused2:
In the shop definitely go with either a long frame floor jack or a bottle jack as I mentioned previously.