If you plan on towing anything, you will need a hitch and possibly a hitch bar. Together, these two pieces of equipment can accommodate just about any load. As hitches can be specific to the vehicle, it is important to have professional assistance when picking out your gear. It is equally important to have your hitch properly mounted, which really does take expertise.
Hitches can be used to tow everything from a trailer to a bike rack. Most have standard two inch apertures, which are then fitted with the appropriate hitch bar to make a connection with whatever you will be towing. If you tow different items, then you may end up having several hitch bars, each to perform its specific task.