Link with reinforcements that make it more side stiff. The two little additional tubes weigh only about 120g (together) and increase the stiffness by a significant factor. Of cause this two tubes are like all reiseradgabel pipes open on the lower end to drain complete. (constructive corrosion protection)
Forks for tire sizes from 24" and above should be reiseradgabel++.
It can also be combined with disc brake or/and reiseradgabel MOTOR.

complete fork assembled (picture shows more extras: cleats and insteat of a lowrider threads a custom rack mount.)