Thanks to gas strut servo-assistance, fixed manual ramps type CR-GAS can be longer than CR, thus overcoming bigger differences of height (preferably positive ones) with simple and efficient movimentation through a rigid side handle.
Optionals:
45-90° beveled lip on last 180mm
L-shaped screwable plate 150x250mm for fixing
Flat lip for small wheeled vehicles, only for 0 or negative differences of height