Miss Kerry Ann,
I will say that ONE large rust hole... is NOT a good thing, but DEFINITELY a bargaining chip if you proceed.
There WERE at least two versions of the 6.2L - the civi version and the J-code that the military required GM to produce. EVENTUALLY GM put the J-code into all late 80's, early 90's GM products, realizing that it was actually cheaper to produce a good motor than have to deal with a ton of warranty issues and unhappy customers.
And welding isn't necessarily needed to repair this problem. There is a thread on this site where a member used automotive adhesives instead of welding. Had pix and everything. The only problem is I can't find it via the advanced search, but I'm probably not doing it correctly.
IF the ONLY problem with that truck is one rust hole (OK LARGE RUST HOLE) and then some rust on the tailgate (the tailgates can still be found in recycle yards, though they are getting a bit scarce these days), I wouldn't call it a deal breaker.
Like I said, maybe you can get the salesman to drop the price.
Your goal of $2000 may be unrealistic ONLY because prices have been rising lately. But, if it sits on their lot for a while, they might consider the price.
Having said that, I paid $2500 two years ago for mine from GL. That was AFTER the GL 10% and taxes. So they can be had, but it will be a challenge for sure.
Oh, and the folks on this site LOVE PIX of vehicles, so when you do get yours - POST PIX.