There are a lot of materials you could use for making the table top. I normally use 3/8” Baltic Birch with a 1x1 clear grain Pine or Poplar perimeter. Side tables can be made to run lengthwise along your trailer or perpendicular.
Here is the adjustable leg; adjusts from 27" - 44" and has a strong flip lock adjuster that easily supports 135 lbs. You simply attach the pivot bracket to your table bottom and then the leg assembly to that.


Here is the two-piece mating aluminum attachment bracket, they are 30" long.


Here is the leg retainer used when to keep the leg from flopping around during transport.

Here are a few examples of tables made with the kit.



