The heavy stones is on a 20 degree ramp the truck creates but not alone, it happens Thanks a lot for sharing, commenting, subscribing and thumbs up. All this models work hard on the mine, and makes so much fun! All models are self made or rebuild. Check out my other videos! ᐅ My Homepage: http://www.modellkran.de ᐅ Twitter: http://bit.ly/2ikFfg6 ᐅ Facebook: http://bit.ly/2hwfBVJ