general problems of the 2004 GMC Yukon

2004 Yukon xl with 91,880 miles. Replacement left front wheel bearing/hub failed catastrophically at 6,046 miles of service. The bearing separated completely leading to a towing event. Vehicle was on an interstate highway and traveling at 70 mph, in a straight line when this occurred. Service technician said the drive shaft on the 4wd vehicle was the only thing retaining the wheel. The prior bearing was replaced at 85,878 miles. The bearing was installed at at aftermarket service center. The hub face has the following numbers etched on it. 730-0093, 12fr18107. When I look this up it appears to be a bearing made by gnb.

I have 4 michelin tires purchased from costco late 2013, type: lt265/75r16, dot m34n 00cx. Less than 30k miles on all 4. All 4 tires are heavily cracked all around the sidewalls. I called michelin and they stated there is no recall but I've never had or seen any tires do this before and I'm concerned they could potentially cause me to have an accident, explode, or shred while on the highway.