Ok theoretically if you were driving say 60 mph, and you could stop your tires immediatly, the ass end of your truck would hop of the ground, because the mechanics of the system is all wrong.
DJDAudio has done a lego model of this with video to show you what will happen, but we all know that your tires will not just stop like that. Now take that motion and slow it way down like you are braking, the same mechanics still apply and it will lift the ass end of your truck instead of make it hold the ground.
Enough brakeing force and you could loose control of the ass of your truck, and create a worse situation. Search for threads made by djdaudio and check that video out. I dunno about you but I wouldnt want that.
AND FOR BAGGINS SAKE THATS NOT A GODDAMN CANTILEVER. ITS A LEVER. Ok Im done.
Edit: here ya go.