My wife's 2007 Acura MDX will probably need new tires soon. The tread looks good but the sidewalls are looking a little dry and I've got a vibration at 70ish MPH and a good alignment. They've got the oem 255/55r18 Bridgestones on them. Don't remember the model for myself but Tirerack lists them at Dueler H/L 500. Any good recommendations for this car?