Yes Kim’s trip was with a single speed 5.0 with 16 inch wheels. He replaced a belt and freewheel after 2400 km because the belt jammed and broke because of deep wet snow. The rest of the trip was accomplished on one belt and freewheel. I kept expecting to hear from him for new parts.
You may find another way to attach a Travoy to a Strida, I have one customer who attached a door hinge to a saddle and used that to attach the Travoy hitch to. The hitch that comes with the Travoy is designed to attach to a bikes seat post.
My hitch works well and has been proven by the person who traveled across the Sahara last year with another single speed Strida 5.0.
I will check with the person near you with my hitch and send you a PM.
Bill