If you are using the rotopax hold downs for those water jugs you should get extensions for them that allow you to use them as what holds your table down. Simply cut out the same size opening...slide the table down over the rotopax turn to lock mount things and voila...mounted table AND rotopax. If you are ever running without the table but the rotopax they should spin back down tight enough to still mount just the rotopax.
Rotopax mount and info on extensions
Rotopax mount and info on extensions