Little background: Last trailer I towed was a tilt bed trailer with a YJ on it with no brakes. My guess is that it was in the 6k lbs range. The truck was slow as all heck, and the brakes wernt the best, but it worked OK at best. Other than that, the truck towed great. I just finished getting my tow bar on my 4runner, and I can barely tell its back there. Brakes work great, still have plenty of power. Only probelm is when I come to a stop and the 4runner isnt directly behind me, it pushes the truck around sideways as the rear brakes lock up. Is there a reason why I have this problem with a 4k 4runner, and not a 6+k trailer with no brakes?