I have a 2010 Titan crew cab. I love my truck since the start. I bought it used with 18,000 miles on it in 2012. Always kept it dealer maintained. Had an accident in 2015 a car ran up under the back of it I was stopped at a red light. Had it fixed 8,000 worth of work done it. It rides fine but in the past year or so I’m noticing at about 60,70mph I noticed a vibration it’s not in the steering wheel nor the rotors, brakes tires none of the common things issues. I have aftermarket rims and tires I put on in the summer, their brand new balanced etc. I still get the vibration I can see my passenger seat slightly shaking and if I have a bottle water in the cup holder I see the water shaking. A couple of mechanic friends suggest to have the driveshaft check for it could be off balanced. Has anyone ever had any issues with the drive shaft or had this vibration issue?