Spare Tire problems of the 2003 Honda CR-V

My wife was driving on I-95 south @ 65 mph. Traveling from baltimore MD to kitty hawk nc on vacation. She noticed a vibration in the car. She pulled over and found the front passenger tire was nearly flat and the sidewalls were coming apart. She had the spare tire installed and continued to her destination. She took the tire to a repair shop. They said the sidewall failed. They showed her where the other front tire was starting to fall apart. The two rear tires were also failing. She had to purchase 4 new tires. All 4 tires were purchased in October 2005. The tires are bf goodrich long trail. All tires were routinely rotated and balanced. I checked the air pressure on 09/10/09. She is on vacation. I will try to have her bring one tire home as evidence. She does not have enough space to bring 4 tires home. The tires have between 7/32" and 8/32" of tread remaining.