Hey everyone, I just got a 2018 GMC sierra Allterrain (looks awesome), but I think it has the "chevy shake." I've been to the dealer twice about it and they have road force balanced the tires and did more maintenance on the tranny and I'm still getting a vibration at 70 mph and higher. So in saying that, I've driven the ram and was very impressed. I would like to trade (depending on the wife) for a RAM hopefully '15-'18. Is there anything I need to be on the lookout for on these trucks used? Or any factory issues that I should look for (like the chevy shake)???? Thanks for any info!!!