I have an interest in this too (1990 4wd pickup stock). I was going to order the rancho add a leaf kit (long and short leaf system) to solve my dragging butt syndrome. I also considered air bad kits, but they limit droop/travel and the bags can get damaged...not too promising, even for a stocker. I was also wondering ZUK's opinion of cutting the overload off behind the rear axle once a "secondary suspension" is installed. The front section of overload may still help with axle wrap. Maybe the lower coil mount can be a ubolt flip kit ...