Yes the PIN already has a taper on the end of it that helps with allignment.
Most electric solinoids are not powerfull enough to pull this pin,
however...Air or hydraulic??????
way to much work and too complicated...IMHO
Here is what WILL work.
Imagine a HD long Valve-spring that holds the PIN in the hole....Now imagine a OEM style e-brake handle (which has compound leverage on a cable) attached to a HD cable....which is attached to the PIN.....
You pull the handle up untill it locks,,,the coil spring force (and friction) is overcome and the PIN slides back releasing the Cross-bar for SUPER-FLEXY use.
Then, when you hit the pavement again, then release the handle...The coil spring then pulls the handle down and pushes the pin back in place...(Of course you may have to rock the rig back and forth just a bit, but this could be done while in motion with just a flick of the steering wheel.)
This is something I will make availble later, however it will be $$$...
There are other ways to do this , also.... Just a big lever with simple linkage would work, too.