UPDATED AUGUST 2025
The QuikrStuff Mach2 bike rack was not designed to carry trikes.
We are getting more and more requests for an add-on that will fit a trike and it is on our long list of products to consider developing.
It might be possible to use one rack and two add-ons and put the rear tires in trays one and three and the front tire in tray two. But you will need to look at the rack dimensions and then measure your specific bike to see if it would fit on the rack in this way.

 
 