Yeah, check to see if it idles like crap due to vac lines, and if so get the guy to knock 200 bucks (or however much you can squeeze him) off because it "needs repairs" then buy it anyways. Vac lines are easy. All in all, the 720 is a pretty good little truck and will stand up to a lot. Mine has about 76k miles, and the first 40 of that it was a farm truck being backed into fenceposts and such and the only things it has ever really needed were new shocks.
Also, do a lap around this thread:
zerothread/481155