So, if i understand a couple points; A, don't want to spend too much, and B, this is part of a legit business?
So, what does your tax guy say? Have you considered some of the Cat (others do it too) creative lease to purchase? I think CAT had some programs where you lease for 3 or 5 years, and then have something like a $1000 option to buy. You get the tax benefit of lease payments, and basically buy it at scrap value at end if lease. Plus, you do have the exit option if things get bad.
How critical/costly/critical path is missing a shipment to your business? I'm not 100% if you are unloading raw materials, or loading finished materials/products, or both; but if missing the fork lift for a few days/week is Critical, I wouldn't feel good with a near scrap value, heavily used, 30+ y/o machine.