"At the same time, the mix of low-profile tires and a heavy-duty truck suspension is always an uneasy one. This is particularly apparent on California's concrete freeways where the rear end can bounce along with the undulations to produce an agonizing harmonic that makes it impossible to have a conversation inside the cab."
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edmunds review of 2007 Sierra Denali a truck that they called: "a confident, muscular and yet sweet-natured luxury machine that rides and works like the pickup truck it is."