Originally Posted by Teamfour
I leave my bars connected but use the tongue jack to take a little weight off and perhaps level the TT a bit.
My opinion regarding the bars is that is depends on how far off level the trailer is. If it's close, I'd leave the bars in place. If it's significantly off, I'd disengage the bars but leave them hanging there ready to put back in the morning; the connection will have a little more leeway to shift with the tongue jack.
Overall, I agree that it isn't necessary to disconnect unless things are too far off level.