I could be wrong on this, but I believe that on one of those trucks, the tires are non-pneumatic. (Solid)
The lower one is the Terex Titan, a mining truck used in Canada when GM still owned stake in Terex. It's now in a museum setting in British Columbia, I believe.
The upper truck has some 3,000 HP, weighs nearly 1 million pounds, and can haul/dump up to 300 tons of material per trip, with a sustained top speed (I think) of some 40 MPH.
It's also a great DD, if you're into that sort of thing.

__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
I'd like to think that people might open their eyes at some point... instead, I find it more and more likely that I'll just close mine.
-- Author kept secret.
Je ne veux pas d'une meilleure vie. Je veux être heureux avec celle que j'ai maintenant.
(I do not want a better life. I want to be happy with the one I have now.)