first time I heard them release on my first air ride , I thought something broke. they released with such a big BANG!!!
You got all the functionality right, except it's not called dock support. If I go to the part store tomorrow and ask for dock support, that won't pop up.
Not sure what the actual name for it is then... That's what we call it in our company shop. Any good trailer repair shop should know exactly what its called if you show them a picture.
I took it to the shop, they couldn't find a name for it too. will take it to parts shop on Monday. I wish I can figure out the name for real.
Hendrickson Surelok. Had many road calls at the ports because they are stuck down and all the weight is on one trailer axle.