I own a 750ix bimmer (2015). Honestly, even with 20" rims and RFT it rides incredibly smooth. Comfort seats of course, massage option adds to it also. Not a suv, you sit lower, but again, it is amazingly comfortable to drive, you feel rested after a long trip, rather than tired.
Quite expensive to maintain, but if money is not an issue, I would look into a limo class first.