That's actually the second stage of my super-heavy lifter, normally used to bring large amounts of fuel into orbit. Never used it as an interplanetary stage before, but worked just well That mountain was indeed very bouncy, the final jumps were about 40 meters high. The funny part is when the rover is falling at about 10m/s, but the surface doesn't get any closer, since it's a downhill, and then all of the sudden it begins to elevate The trick to keep the rover somewhat steady was to hit F for a moment after every jump, realigning the ASAS with the new surface angle.