Sounds fishy to me. I had a set of the Michelin's on a Pathfinder, and found they offered a smooth & quiet highway ride. They were P-rated (as they are in your size as well), so that is to be expected.
Both the Geolandars and the All-Terrain T/As are LT-rated, so I'd expect either of them to ride much stiffer than the Michelins.
I've never driven the Geolandars, but have heard nothing but good things about them. I have driven on the All-Terrains and found them to offer a much quieter and somewhat smoother ride than I had expected. They were on a one-ton van, though, so they might not ride as smooth on something a little less portly.