I recommend using the Master Lock Hitch Receiver and Coupler Latch Lock Set # 2848DAT. This doesn't require that you use the key to tighten the lock as you mentioned, and includes a keyed alike coupler lock should you be towing a trailer.. This device is great for ball mounts and hitch mounted accessories that don't come with their own threaded anti-rattle locking device, and is a confirmed fit with the Draw-Tite # 76199 hitch that fits on your 2018 Alfa Romeo Stelvio.
I've linked a short... view full answer...