American vs European race transporters

I've seen that each American race transporter I've seen makes use of these liftgates which can be held horizontal by chains and may't actually pivot up and down until the gate is being closed and an additional set of chains is used, whereas Euro vehicles appear to universally use hydraulic gates that may be tilted and transfer at will utilizing hydraulic pistons and a distant.

Does anybody know why it's like that? Is there some form of regulation that forestalls American vehicles from utilizing hydraulic elevate gates? The European resolution appears far more handy to make use of, however I've by no means seen a single American one use the identical expertise, so it makes me surprise if it's a matter of legality fairly than comfort or custom.