hey
saided18, i'd be guessing that the reason for the bouncing is high profile tyres on your backhoe...
like what keith said, "strut" is a shock absorber...just a type of shock absorber. that's the best way to describe it.
jliao, a tower bar (strut bar, strut brace) connects the top of the shocks (struts...whatever) to each other. they are fixed points and do not move. they just help stop the body of the car bending or flexing.
sway bars connect the moving points of the suspension. as the car say turns left, the right side of the car compresses as it has more pressure on it, the left side goes up. the sway bar is basically a metal bar, like logan said, connecting the two sides. the thicker it is the harder it is to twist in opposite directions, so therefore the right side of the car doesnt go down as far and the right side doesnt go up as far....keeping the car flatter.
hope this helps
later