I think that the fact that you are considering helping them is admirable and speaks to your character but I agree with the rest that this should not be your problem.
IMO he had four weeks to look at the truck and it really doesnt take much to inspect it to see if its 4wd or not. It s a tough call but he had the opportunity to see what he was buyingOn 8/1 my new truck went into production, so I listed my current truck for sale (2014 F150 XLT Supercab RWD). On 8/22 I had a guy make me an offer. Because I didn't have my new truck yet we agreed that we'd wait for it to come in. He was getting a little antsy waiting for it the past couple of weeks, but it finally came in and I sold it to him today. It is a 2014 F150 Supercab. 10 minutes later he called because he couldn't find the 4WD.
The issue is it's not 4WD. I never made any claims that it was 4WD, or did anything to suggest it. When I made the sale I believed he knew it was 2WD. He had the right to inspect the vehicle, and I assumed that if it was important to him he would of asked.
He offered me $500 to undo the deal. By the time this happened the title was signed over, he had a bill of sale that indicated it was sold "as is", I had the license plates returned to the DMV, and I cancelled my insurance.
On one hand, he was willing to wait for 4 weeks to buy a truck that he believed he loved. He even paid asking price for it. I also never specified that it was 2wd. On the other hand, I told a dozen people over the past 4 weeks that it was sold, and I don't know if I'm willing to take the financial risk by undoing the deal Also, if I undo the sale I'm pretty sure I'll have to pay taxes and registration again. We live in Nebraska and the guy lives on a country road, 4WD is pretty important. I made the same mistake when I bought it, and ended up being just fine after 5 extra-snowy winters.
Would you undo the sale or just say its his loss? Or something else?