Towbar Mounted Car Bike Carriers
Towbar mounted bike carriers are the most common, and generally the cheapest way to carry up to four bikes. The carriers use the tow ball as a big nut and bolt to hold them on to the towbar.
Towball mounted bike carriers attach directly over the towball, making towing impossible while the carrier is fitted.
If your towbar is a removable square tube, you can also use a receiver hitch mounted bike carrier.