When GTA: San Andreas came out, me and a mate set a challenge. Which was to get any vehicle up Mount Chilliard, and even land a plane on it (and take off again) if possible. I managed to get a truck and trailer up there, he nearly got a combine harvester up before it fell off the mountain. He managed to land a small jet on the mountain, but couldn't take off as there wasn't enough room to do so. I did get a military jet on there, and took off again as i was able to rotate the thrust.