HELP!! i have a problem, when i spin my tires, the rear end hops hard, like a vibrating feeling, my crap 89' truck does this, but i expect that. I believe i caused the problem by putting like 2 80lb sand bags in the trunk, only thing is wtf did i blow- lol? I replaced my main rear shocks with some $20 doller autozone ones, and it still does it!! i dont know if maby i ***ed up the quads, the springs, or my cheapass shocks arnt working, also when i go over say a speed bump, it bottoms hard!! help what did i mess up? thanks