We do not have access to vehicle wiring diagrams but we do have a confirmed harness fit for your 2014 Mercedes-Benz GLK-350.
The 4-pole wiring kit for your car is the ZCI # 119250KIT which installs without having to cut or splice any wiring in the vehicle. This advanced wiring kit includes a circuit tester which will allow you to determine which vehicle wires carry which particular function. This enables simple installation using the zero-contact clamp-on connectors in this kit. No permanent... view full answer...
The 2-inch hitch I recommend for your 2013 Mercedes-Benz GLK-350 is the Draw-Tite # 75774 which includes hardware for its no-drill installation. This is the highest-capacity option. A video is linked for your reference. This hitch has a rating of 600-lbs of tongue weight (TW) which is the downward force on the hitch from what is connected to it. This capacity is plenty for your 350-lb total chair and carrier weight but as you noted ground clearance can become an issue when entering steep... view full answer...
We do have ball mounts that fit 1-1/4" hitch receivers. I have linked you to a page listing all our fixed 1-1/4" ball mounts. You will want to filter these by the size drop or rise you need. I have also linked to a FAQ page on Choosing the Correct Ball Mount. So if you find you need a ball mount with a 2-1/8" rise, you will want part # 3593. This ball mount which includes the pin and clip. If you find you need a 1-7/8" diameter hitch ball you will want part # 19256. view full answer...
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