I understand from you post that you are having trouble getting the bars off the L bracket. Once they are off can you move them back and forth in the head unit? Is that where it is too tight or is the problem that you can't pull the bars off the L bracket. If it is just he latter you need to jack the trailer tongue up very high When it is high enough if you kick the bar it will move above the L bracket. For me this means lifting the back end of the truck quite a bit until the bars are free. How high do you raise the tongue when trying to unhook?