This pedestal is a three stage air assisted mount. It is mounted solid to the floor as well as the table, so it is not removable like the medieval knee destroying contraption.
It will rotate a full 360 and adjust to the height of the bed so it can still be used for sleeping. I believe the height adjustments are 14 to 28 inches, but I would measure your table rails at the bench level to make sure you get the right height adjustments. I think all 21DS trailers are the same though.
This pedestal was originally only available from Springfield Marine, but Camping World carries it as well on sale right now for 254 smackers.
https://www.campingworld.com/search?...l&lang=default
With the table up and locked it is very stable. No wobble of any kind. I did use construction adhesive on the screws on the bottom flange and made sure they were of the right length. Did not want them to stick through the bottom of the slide. I used some pretty fat ones and I believe they were 3/4 length. It has been a while. The construction adhesive will prevent them pulling out.
The top is mounted same way. The clamps are adjustable for tension and when unlocked from the bed position, the air assist will push the table up to full height. No more lifting.
It is a bit tricky to push down the table and reach under to lock the clamps, however, we do not use it very often that way and if so, I have a young critter walking around who loves helping out Grumpy.
As a bonus, when rotating the table 90 degrees so the long end is pointing to the window, it creates additional room for the beer belly.