The medium kit which will work well for anyone not looking for maximum ground clearance and isn’t running a lot of weight in the rear. This will NOT be good for anyone running a bumper mounted spare tire.This WILL be the best option for anyone running revalved shocks from Yokley Racing (William 270-734-4548).
The “heavy” rate is for anyone running some cargo weight or needing max ground clearance. Also if they are running a “desert car WITH revalved shocks from Yokley.
The “desert heavy” kit (DHVY), if for extremely heavy cars with cages, doors, fuel cans, spare tires, etc. who don’t want to get the shocks revalved. This will ride pretty harsh when unloaded.