Sharon uses a Yakima Hold Up 2″ receiver hitch rack on her car. It’s an older version so not exactly the same as what’s shown on the Yakima site, but looks pretty similar. We had never used it for a fat bike until the Missing Link Tour.
The Pugs went into the rack with little difficulty with its 4″ tires. The front wheel was secured normally with the rack’s arm. I added a small bungee to the front wheel so it couldn’t move. It doesn’t sink as deeply into the rack slot as a skinny tire MTB would.
The rear wheel is too fat to use the rack’s ratchet strap. So I attached it with another bungee cord. It held fine like this for a short-ish drive to Lake Cowichan. For a longer haul or if I was going down some rough roads I would use something more robust to secure the rear wheel.
The Krampus dropped into the rack without any special accommodations.