Why? What would these pipes do for the truck?

If you only want to make a render from one angle, the classic method I would use, would be just to delete (or hide) hidden faces. Hide the back corner wheerl, hide the paneling on the face side you...

Noice.

If the inside missle is fired, does it hit the front wheel arch? Hehehe

You used a move along a curve whatsit to animate moving treads? Or another way Ive not thought of?

Fluffy dice on the rear view mirror, nothing more extreme than fluffy dice.

Said its not to model a car and say its for extreme speeds. I took that as to mean it mustnt be a car car for any condition that a car can already traverse, except extremes of climates.

Seems like a poor idea, from a design point of view, to give it wheels on the ends of legs, it makes the wheels redundant and a stability risk. Since youve already got a wheel, I'd say a "Modified...

Go with both. Blocky with rounded corners. Completely hard edges might look a bit odd, but smoothing might give it a futuristic "blocky" look and still look sleek.