[mykle57]

If you're going to approach an owner be sure you can:
Accurately make a fair market value assessment of the vehicle on the spot.
Make a convincing/compelling offer for the vehicle
Have a pocket full of cash to pay on the spot
And a tow vehicle standing by to haul it out of there immediately
Otherwise, your offer just became the 'ridiculous lowball offer' story he'll be telling the next buyer who knocks on his door.