its just scale, they seem small because you see them on the screen. its something not unlike the uncanny valley effect, you just feel disassociated from the truck because its not as big as you know it to be in real life. to scale, the smallest of jumps are actually quite big in real life.
and they only bounce that high because you're dropping sixtey feet to flat, i think they dont bounce enough sometimes, just seems too perfet, i like bouncy like avenger is.
anyway, welcome to the fourms, enjoy your stay