A fixed flange type towbar is the oldest type of towbar, more commonly found on vans, pickups and also used with the older type of caravans that required a bolt-on type of stabiliser. This type of towbar is not recommended for vehicles with parking sensors due to its size it can cause interference.
The most commonly fitted towbar as it can be used for almost all applications, trailers, caravans and most modern tow ball mounted bike racks. It also tends to be the cheapest type of towbar available. Because this towbar is fixed it can sometimes cause interference with parking sensor systems if fitted.
A detachable towbar is the best option for a vehicle fitted with parking sensors as it can be removed when not in use so it does not cause interference. Detachable towbars are usually the most expensive aftermarket towbar option.
A retractable Towbar is the most common type of towbar being fitted on new vehicles by the manufacturers. These are available as an after market option for some vehicles, but they are very expensive and are usually made to order.