Morgan 2.7

My 2022 1500 2.7 4x4 has recently started having noticeable vibrations at 9,000 miles. It began with only vibrating around 23-25mph (mostly during gentle acceleration and cruising at speed) but has increased to vibrations at multiple speeds. The vibration isn’t noticeable on more aggressive acceleration, but feeling like driving on rumble strips if you are cruising at speed. I have taken it to my dealership 3 times within the past month with nothing being resolved. (2 of those the service manager and a technician rode with me to verify the vibration after they said they couldn’t replicate it on the first visit). They have asked me to drop it off again next week, but do not have a plan of action. I was hoping someone has had their issue resolved so maybe I can point them in a direction, since it’s starting to seem like the dealership is just holding the truck for a couple days at a time and returning it without trying to resolve the issue. thanks in advanced!