Those video's are from iceland. They do a thing called formula offroad. The water skimming is cool and they drive there paddle tired,nitrous injected big block jeeps up some hills that you have to see to believe.
http://www.youtube.com/watch?v=Eqx6ONBA8MQ I can't afford to do that so I built a t-maxx with pro-line paddle tires, spools front and rear, robinson raceing gears throughout, picco .26 maxx. I haven't tried water skimming yet but I climb some really steep hills.