Interesting product - I wish I had seen this considerably cheaper alternative to the Curt product I installed. I'm only hauling 2 eBikes on my rear rack, so I'm thinking the Curt hitch solution may have been overkill, but it's definitely very, very stable. I'm just posting this as another option for you to consider.
Here's the link https://www.amazon.com/gp/prod...le?ie=UTF8&psc=1