For $500-$700, you can buy a little 5x8 or 6x10 trailer to haul the hay. You'll get 22 mpg out of a 1/2 ton, vs. 14-15 out of a 3/4 ton during daily driving, so you'll still come out way ahead over 5-10 years. Plus, the trailer will be easier to load and unload.
If you could somehow work a question about purchasing a chainsaw into this thread, we could hit 10 pages easy....
