I would use edelbrocks idea...

Anti-Hop Bars relocate the upper trailing arms to change the instant center of the rear suspension. This will improve the chassis reaction and increases the effectiveness of sticky race tires. The Edelbrock Anti-Hop Bars are one of the most effective and easily installed traction improvements.

I would connect the adjustable upper arms to the pumpkin with a ball joint or similar. The idea here is to reduce the side to side movent...

I got this idea when I saw the rear end on a newer Jeep ...

If it is beefy 'nough for off road it should work ...