Could be any number of things.
The easiest, and very common, is bad tires, bad alignment or poorly
balanced tires. It is amazing how much effect the balancing can have.
Also, could be failing ball joints, or any other suspension issue.
If it could be described as waddling you can feel at very low speeds, I vote
for a tire tread separating. A good tire tech can feel it with his hand, but
even when they try to teach me I have only been able to feel it once. I
suggest a visit to your tire shop first... after all, they are happy to
check the tires for free in hopes you need some!
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