I am a automotive tech. However. I would calculate the wight of the each 1/2 door and use the size vector below ( shadow ) × tge hight = the feet of side beams stay off thd ground to cary the wight of tge each 1/2 door . Vector calculus. Now, I would use grommets and springs , stoppers , just like what you see on a truck doors to use for lasting , wibberting , smooth opening or closing. Make sure to leave some games to adjust the vertical so if you let tge door go , it goes slow and nicely toward its rest point . Take a look on hour refrigerators door ser up .can't be better than that . I won't make a army tank out of my gates . Not needed . Good luck .
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