u/Apprehensive-Cap-914

Anyone else with a i-FORCE MAX get a deep vibration/humming from the passenger side back seat area on the freeway?
It’s not a rattle or tick like others have posted about. I almost always think it’s someone next to me with their bass turned up, but then realize it’s coming from my truck. Not sure if it could be the hybrid battery under the rear seat or if it’s something else.
Anyone else have this or figure out what it was?