i have 2003 base vibe and also just bought 2004 corolla ce with 92,000 miles. corolla was humming big time at highway speeds . changed tires. still humming. changed one rear bearing. still humming. changed other side bearing. car quiet now.both rear bearings were bad. so far vibe bearings still doing ok at over 90,000 miles.
dang you had good luck on the vibe. Each car is different and will wear different. You have to admit though if 2 wheel bearings were all that broke? thats GREAT.