How many miles does this Burb have on it? Manufacturers are uding ball bearings now for wheel bearings instead of tapered roller bearings in order to get the lower rolling resistance, and they’re not lasting as long.
Jack up each corner, spin the wheel by hand and listen for noise, check the wheel for looseness by trying to manually wobble it, Also, if you’ve been unable to verify anything, you can try removing the wheel and turning the hub by hand. There are cases where roughness in the bearing can be felt that way and not verified with the weight of the wheel on the hub.