Tire Bulge problems of the 2000 Volvo V70

Continental contiextremecontact radials size 205/55 r16 v speed rating, purchased on 7/10/08. Tires have approximately 10,000 miles at incident date. Upon arriving at destination after a 9 hour trip traveling at approximately 67mph average, both right side tires had large bulges in the sidewall. The right rear tire has a golfball sized bulge, the front right tire slightly smaller. The sidewall has obviously failed and the tire is quite spongy at the bulge. Failure was caught before an accident was caused, however this could have been a loss of life accident if the tires had failed catastrophically.

Two toyo proxes tpt 205/55r-16 (94v all seasons blackwall) tires have failed within six months of purchase and 10,000 miles. The sidewalls have developed thin spots that are bulging outwards, on the verge of a blowout. These tires were replacements for toyo proxes fz4 blackwalls p205/55vr when one of them blew out through the sidewall after 2. 5 years of moderately light usage. Because two tires (both driver's side) are affected, I can't click an appropriate box on a following screen.