Most of the tables at the Fort have been updated to a 4 sided plastic table. Each side being the same size. Here is a pic from one of my campsites in November. Sorry, only half the table is visible on the right hand side, but it gives you an idea.
I had thought all the tables had been upgraded, but on that same trip I started off on site 1461 and this table was on that site:
So there is a chance that you may get a wooden table that looks like the second one. I had thought they had all been replaced, but apparently some are still floating around.