Hailofatime

I just replaced my 2014 Silverado LTZ Z71 with a lightly used (4,200 miles) 2016 GMC Sierra Denali 1500 thinking moving up to the 6.2L engine and the 8-speed tranny was going to be a nice step up, not to mention getting my truck back to full warranty. The only thing that I had an issue with on my 2014 Chevy was the 6 speed transmission was pretty hard shifting and the 5.3 is somewhat lackluster in power when pulling anything, other than that, great truck. Long story short I purchased the GMC yesterday and on my 300 mile journey home I began noticing my passenger seat making a noise and vibrating a great deal. This persisted the entire trip at 70-80 mph. The vibration varies, but is so bad that I can't rest my head on the headrest without getting sick. My question for anyone that has had this issue is should I head to the dealer, can't get me in until next week, and try and get this fixed? My other option as of right now is to take this truck back to the dealer I purchased it from and get my old truck back. I love everything else about this newer truck, but I don't want to deal with a headache of something that they may or may not be able to fix. I'd appreciate feedback from anyone who has had this issue.