The problem with old gas in itself(not including grime and other **** that's built-up), is the ability to detonate, it's volatile properties degrade over time. I agree with Chris, mixxing some high octane with it will help, the biggest help you could give it is mixing a ton of alcohol in with it, but alchy can erode rubber in your fuel system, so the best/safest route would be to drain, clean, and refill.
But to answer your question about getting it home, throw about 3 bottles of "HEET" into the tank and rock the cab back and forth to help it mix. I personally would never pay $2k for a 2wd in the condition you're stating it's in. My 95 ECSB was an almost flawless DD with 189k on the clock and it cost me $1400....but I'm sure the economy has had a different effect on different regions.