I’ve been following this thread and have been wondering if it’s indeed the tires, as in tire size/aspect ratio. Although a tall order, would be great if you had a friend with a Land Cruiser that would be willing to swap OEM wheels with you temporarily. By noticing any change on your ride, could help eliminate many of the other suggested or guessed at h/w causes.
Until earlier this year, my daily driver, since 2006, was a 2003 LC with 18” wheels. I’m happy with my new-to-me LX but it definitely sends a jolt when the wheels encounter a pothole or other “road anomaly”. Later this year I’ll be mounting some 18” Michelin’s on some rims I got off of eBay. They are off of a 2020 LC. Am looking forward to it. Yup, I’m a wimp
Cheers,
John