RockyMounts MonoRail 2

Fits both 1.25-inch and 2-inch hitches, which means it follows you if you change vehicles. At 44 lbs with aluminum construction, 50 lb per-bike e-bike capacity, tilt-away, integrated locks, carbon-frame-safe. The expandable design goes from one to four bikes with add-ons. I recommend this to buyers who want flexibility — it handles current and future needs without locking you into one hitch size or bike count.