Shaking is a balance issue. I had a Tundra 5 years ago, got new tires, dealer charged me for mounting and balance, but clearly only mounted them, and as soon as I got on the highway, rough ride. They balanced it after that, and was just fine.
Just picked up my SR Lariat last month, and it rides...
My husband saw this 7.5 k usd credit by ford this week, and promptly located a dealer 30 Miles from our house, and went and bought the truck this weekend. It was 76 K for a Lariat SR, and with the ford credit, the fed tax credit, and the mass tax credit, it ended up being a 53.5k USD truck...