Exterior lifts plug into a corresponding hitch receiver, including Class I for up to a 200 lb. capacity lift, Class II for up to a 350 lb. capacity lift, or Class III for up to a 500 lb. capacity lift. (It's important to note that the vehicle's hitch receiver does not come with the lift, and must be already installed on the vehicle.)
Boom lifts typically require minimal installation by bolting to the vehicle's floor
Interior platform lifts mount using existing points, requiring no modification to the vehicle in most installations
For power, lifts either features a universal electrical connector that mates with the hitch's existing light connector, or are entirely self-contained with a rechargeable battery pack that powers the lift, where a vehicle plug is not needed.
Note: Although most lifts feature very practical do-it-yourself installation, many are also available with optional nation-wide installation, where a skilled technician will come to your residence to professionally install the lift for you.