if you needed to replace your fuel tank, just strap on a 55 gallon drum
To clear snow, just toss a car body onto a train chassis
or clap together some tractor parts to make a road grader
All found on http://bangshift.com/general-news/more-historic-gearhead-americana-barney-oldfield-classic-truckers-pre-historic-indy-racers-and-more/