The Rocky Mounts MonoRail is the 2 bike platform hitch rack on the market under $600. 

Road, mountain and fat bikes all fit easily, as do kids bikes with 20 inches wheels or larger. It holds women's and other step-thru bikes without using an adapter bar.

No bike frame contact, sliding and locking hooks clamp the front wheels.

And with a weight carrying capacity of 60 pounds per bike it's strong enough to carry most electric bikes.

Includes locks for the bikes to rack, and for the rack to the car.

An additional bike mount to expand it to carry three bikes is available for $199.95.

Available for either 1-1/4 or 2 inch hitch sizes, does not convert for one size to the other.