My guess is different from Dutch Star Don's. Ours is a similar, maybe the exact same, set up as the OP's. But, ours is tight with no table movement. What I'm guessing is that the top bracket (mounted to the wall), may have been installed a little too high on the wall. Thinking that if it were a teensy bit lower, that the table's bracket might fit more tightly when it was leveraged into it.
03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E