Hello all I have a 2015 Town and Country Limited with 60,000 miles on it. I noticed a slight shaking in the steering wheel at about 70mph but the back seats were shaking pretty badly and I could feel the shaking more when I was in the back of the van. I already tried having the tires rotated, balanced and had the alignment checked. Any ideas on what it could be before I take it to the dealer ( had tires rotated etc at Firestone)? Hoping whatever it could be is covered under my extended warranty. Also do you think it is safe to drive?