I've found a 92 D/W250 for sale near the house, the body is in perfect condition, not a spot of rust or dent to be found & the interior is in great shape. It's a LB dually LE 2wd with an automatic & only 188k miles. They're asking $8000, but I think I can get it for about $6500. First, what's the difference between a D250 & a W250?? Second, what issues do I need to be aware of before I put cash on the barrel head??