Big Truck Burnouts

So I was watching videos on Youtube of various truck shows/events, and alot of these trucks smoke all eight drives better than any muscle car does its two. I'm wondering, with the gear ratios in trucks, how is this done? I thought you would have to use low gear to get the power to do this, but then you wouldn't have the "road speed" to actually smoke them? Use too high of a gear and the axles would hop wouldn't they?

Thanks to anyone who can shed some light on this, and no, I don't want to do it on my own truck, just wondering how it is done.

 

Back when I was hauling mats for the pipeline, I ran into a hand that had a W900 that was souped up to 1425 HP, and he said that when pulling steep grades he had to be careful cause when the power would come on it would spin the wheels inside of the tires! After seeing how effortlessly these trucks can burn out on those videos, I don't doubt him!