It all depends on how I'm parked when I unhook but I've never had my Blue-Ox towbar bind so bad I couldn't free it where I set. It swivels side to side (it could make a complete rollover if that was possible) as well as the arms independently moving up, down and sideways. If the arms won't release with a push on the release leveler by hand, I'll raise my foot and give it a stomp which has always worked for me. That only happens when the towed and the MH aren't lined up. Whether they're level or not is another problem for me. I have to take the pins out of the towbar before I can rock my towed to engage the driveshaft disconnect to drive it. If the towed is higher, no problem, it will try to move forward enough to loosen the pins but if the towed is lower and pulling on the arms, I can't do anything but set the parking brake and allow the motorhome to come back an inch or so. I only need to move the towed a few inches to engage the driveshaft.
Like I said, I've never seen it as a problem I couldn't easily overcome. In the old days when I had fixed arms on a cheaper towbar, I made sure to connect and disconnect on level ground to avoid problems. I'll be keeping my 20+ year old Blue-Ox.