Tire Bead problems of the 1999 Chrysler Town & Country

I bought 4 douglas p215/65r16bw tires from wal-mart in piscataway, NJ in February, 2006. Those douglas tires were acknowledged to have been fabricated by goodyear to wal-mart's specs. My vehicle is a Chrysler Town & Country ltd, which for me has been a wonderful, reliable vehicle. I have driven the car 20,000 miles since then. The tires show only modest wear and I thought were performing well, driven mostly in florida, where I now reside. Six times since then I have taken the car to a wal-mart store because of a slow leak in the tires (I had purchased lifetime service), and each time some work was done which temporarily seemed to resolve the problem. This week I took the car in because the air leakage has become more severe. I was told that nothing could be done because the tires have "dry rot" caused by exposure to warm pavement and sunlight. They will not touch the tires because the bead is so delicate it could break at any moment. I am now afraid to drive the car lest a catastrophic failure injure me, my family, or others on the highway.

Wheel rims are are leaking due to oxidation on the plating. All tires leaking air weekly. Note the number of complaints about this problem indicates it is common to this vehicle.