It’s a total no-no.
They use sliding 5th wheels with an in-cab control so no need anyway, and if in doubt you clunk home, clip in, legs up a touch, shunt button on and pull and turn enough to get in. Shunt off of course before climbing up, and legs all the way when ready.
edit - uncoule - then reverse it. Get the angle to undo the hoses, shunt in, park, then shunt off, park brake, and finish up.