I happened to pull up a video of a trailer hitch trike rack, where the guy was demonstrating how easy it was to load, with a 20" rear wheel Terratrike...  towards the end of the video, it shows the load from the rear of the car, and you can see where he has caught the chain in the channel alongside the tire, strapped down.  NOT the recommended method..!!!   So, I sent him a lighthearted note, pointing out the little gaffe...
 

 
What's funny about it is that the video is from 2014, with over 6,000 viewers....  and nobody noticed it, or at least they never mentioned it to the owner.  He got a good laugh out of it...