will say this...
-Rick Hendrick Chevy: checks alignment at EVERY visit (in the bay where you pull in). never said nothing. Tons of work on our truck, oil changes and little things under warranty.
-McElveen GMC Buick: first visit, out of warranty at 43k. they found the alignment to be bad, which they said was wearing the front tires bald on the edges (i thought it was just the crappy Bridgestones). They found two items to be flushed for $300 each. The Battery died the next day, second day the side zone radar went out, third day the engine started missing due to an AFM malfunction.
so yeah, you should be wary of the dealer...