Detachable ball hitch

I towed with an MVG detachable towbar with no issues whatsoever - when you feel the weight of it you will realise how sturdy they are. Once in position they are locked in place so there is no way thay can work loose. There is a plastic blanking plate which blanks off the hole when the towbar is removed. Picture attached which may help (This is from my old towbar so is spare)

I also have a detachable towbar on my new car - different brand but just as sturdy.

Dont forget to sand the paint off the towing ball before use so the friction pads in the towhitch get a good grip. Also check that there is sufficient clearance between your bumper and the towball to allow the caravan tow hitch to drop on.

Hope that this reassures you

We have only ever had detachable tow balls.  No issues whatsoever.  Really dislike having a fixed towball on the car all the time. 

1. The ones we had you just pushed them into to the fitted bracket they clicked in then with the supplied keys lock in situ, as pointed out they are a fair weight but at least you don't bruise your shins 

Please correct me if I'm wrong, and certainly this is the case on my car, the key is to unlock the towball to be able to remove it. Locking is automatic when you push it into the fitted bracket. 

Seems there is various ways in attaching and locking. My 3 year old Witter detachable inserts, clicks and secured, it then has the option to lock using the key to prevent removal from its socket. Default is unlocked.

To the OP, I have been using detachables for many years, go for a reputable brand, no need to worry regarding their safety.