Chevrolet Trailblazer probably not the car to buy!

I had had my Chevrolet Trailblazer 4*4 for a year and a half when it started making a terrible grinding noise whenever I turned to the right. The noise is getting worse and is when braking too! I have taken it to 3 dealerships to get the problem resolved ( meaning 3 days without a car!). Each dealership gives a different diagnosis and only the second dealership actually attempted to fix the problem. The 3rd dealership then told General motors what the issue was (apparently a wheel bearing in the axle). GM SA now want the vehicle back for a 4th day to re-confirm this diagnosis. They then will order parts and only then fix the problem. As my job involves driving, this means at least another day which I am unable to work plus huge inconvenience. Their customer service is SHOCKING and they seem completely uninterested in resolving the problem. I am a single mom during the week, of 3 small kids who are all in car seats. We specifically purchased the 7 seater vehicle so that we are able to fit one child in the back (as putting 3 car seats in a row was not safe and possible in smaller vehicles). Now we are doubting whether we chose the right brand of vehicle