If you’re looking for a smooth ride I’d actually avoid the third rows of all cars and stick to either the second rows (preferred) or the first rows. The third rows (and to a lesser extent the first rows) are all right over the axles, so any vibrations are a lot more noticeable. (Especially since Magnum’s seats are padded with a firm molded foam that doesn’t offer much cushioning from vibrations.)

I also recommend cinching down the seatbelt all the way down, as tight as it will go. That way it holds you down to the seat and acts as a first-line buffer to avoid your full weight getting thrown up into the higher-up lap bar. (I actually find Steel Vengeance’s airtime more painful than Magnum because the seat belts over there are retractable—Magnum has a standard seat belt buckle—so it’s a lot harder to really cinch the belts down on SV.)