The Curt Trailer Hitch Receiver Adapter part # C45785 will reduce the tongue weight capacity of your trailer hitch by 50% according to the manufacturer. This same statement holds true for pretty much any other hitch adapter like this no matter the manufacturer. The reason that this will reduce your tongue weight capacity by 50% but a ball mount will not has to do with a supported vs non-supported load.
If you were to place a bike rack on the rear of the vehicle using a hitch adapter, the... view full answer...
The Roadmaster Even Brake # RM-9400 that you referenced is compatible with a 2013 Lincoln MKZ. It fits the hybrid and non-hybrid models. Due to the universal design of this system it basically fits all vehicles. view full answer...
For a 2014 Lincoln MKZ you can use trailer hitch # C12091. The lower air deflector will have to be removed to install the hitch but there is no trimming of the fascia required.
I have included links below to the installation instructions and a video showing an installation for you. view full answer...