The Falcon seems to have the full door moving up and down. Not sure if it is a better system or not as I've not seen it in action.Personally I don’t like the Ifor easy load ramp which collapses loading sheep on uneven ground and makes me think I’ll chop a finger off in the wrong place at the wrong time! Newer ones might be better though?
Indespension is similar but locks off with a solid bar and pin, slightly more faf but won’t collapse when loading.
I can't figure out how the Bateson 336 works from the photos - doesn't look great from photos, but maybe someone can explain.