Tractors ? cool.. well, if you are not looking to spend much.. just buy a cheap palm orbit sander. Or, if you wanna spend some money but not too much... Dynabrade is pretty darn good.. and can be had for cheap.. check out thetoolwarehouse.net and sjdiscounttools.com for good prices on them.
BTW hutchins make quite a few DA's now. fine, aggressive, big, small, heavy, light.. etc..
For more detail on type of DA... for paint and body.. overall, I'd say a sander with 3/16" orbit is just right.
The vaccum question you had.. if a DA supports the vaccum thing, you dont have to use it. And, the IR ones would do you pretty good... however I'd say if your father in law had a hutchins.. you wouldnt want anything less.