Looking at it I think it would help spread the load over both axles if on uneven terain. Such as going up a curb. If the front axle were to hit it would allow the rear axle to be pushed down to the ground. Where if it did not have the leveragy rocker thingy when the front axle went up the curb it would take all the weight while the rear axle floated in the air for a moment.

89 2dr 3.0 AT, manual hubs. 33x12.5 MT
gen 2 coils,Cranked front tbars
Dons rocker protection, Front/Rear Bumpers. ARB rear locker, 2" BL, Beefed up skid plates/trailing arms. Gen II uca, 2 Bouncy seats www.youtube.com/TagGeorge