Could be a lot of things. If you happen to have a GoPro you can rig it up to examine what may be causing that noise during drive time.
Best bet is to have a shop figure it out by putting it on a rack and doing some digging, Goodyear has been good to me with regards to those sorts of services. They will give you a price to fix and you can say no or fix it etc... Minimal charge for that service if any.
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