I have a question for big rig guru's... On my way to Victoria this past 2 weeks, I saw these 2 dump trucks. Normally dumptrucks here in Cranbrook have 2 front wheels, then 2 sets of duallys axles in the back. These trucks I saw driving through the US had 2 front axles, and 2 rear dually axles... What are these for? Would it be harder to steer, or are both the front axles steering? Also, on any dump truck, there are these "can" things on there axles at the back, I don't know what there called. Anyone know what i'm talking about?