I Have Cargo trailers , the Chariot Hitch is used on my Carry Freedom City Trailer, the Burly is their Flatbed.
Burly when worker-owned Co Op was a round end , round tube tow bar , now the Private company Imports from Asia (PI) that uses square tube
It is what is sold Now , the stroller kit uses that 2nd square tube 1 on either side of the trailer Body.
Wike does not sell in the US, Unless you import it Yourself.
I worked in Bike shops . It's not a Family Wage Job . I never spawned.