I use a Yakima holdup hitch rack, with the extender so it holds a total of 4 bikes. The whole thing folds up against the car when not in use but probably weighs well over 100lbs and is quite unwieldy to install / remove / manipulate. Plus, it sticks our really, really far. (Gotta be careful not to scrape when backing down things such as . . . I dunno . . . my own driveway, oops . . .)

I attach a flag to it when I have the extender on. It’s also super pricey, but I got a pro deal so it wasn’t as awful.

So there are some cons, but it is super solid, easy to get the bikes on and off of, and holds just about any kind of bike snugly without them banging into each other.

One other thing I added: a gnarly Kryptonite “noose” style chain and “New York” lock. Because I like my bikes.