The model 200 can lift up to 200lbs including the weight of the attachment being used.
The model 400 can lift up to 400lbs including the weight of the attachment(s) being used.
Example 1: 5 bikes weighing 30lbs each total 150lbs plus the weight of the carrier of 50lbs give a total weight lifting of 200lbs.
Example 2: If your purchase the model 400 and a Double Trolley you can utilize two separate attachments with The Lift.  Assume you are using a bike rack for the top Trolley and a cargo rack for the bottom Trolley.  The bike rack weighs 60lbs and the Cargo Rack weighs 60lbs.  Now you have 400lbs – 120lbs of the attachments = 280lbs of gear you can lift between the two.
IMPORTANT: It is important to note that each Trolley is designed to lift 300lbs maximum.  So, in order to lift 400lbs you will need to purchase and use the Double Trolley so the weight can be distributed between the two Trolleys and the associated attachment. Each Trolley can lift up to 300lbs separately but the model 400 can lift up to 400lbs total between two Trolleys.