Tow bars come in many different shapes and sizes, and which one you should buy will depend entirely on your towing needs.
When it comes to being adjustable, it is often not the tow bars themselves but the brackets which are adjustable.
You will only need to purchase an adjustable tow bracket if you have a car with a very high road clearance. If you drive a 4x4 vehicle and you want to tow a trailer or a caravan, you might find that the tow bar on your car is positioned too high up to safely attach and tow the vehicle.
A standard tow bar will not allow for this additional height, but you can compensate ...