Anyone have the specs on the rear coils? I'd like to order some custom coils to replace the stock ones for a little better tow support. I'm running firestone airbags right now and they have been working fine for 70k over the past 2 years. I just don't want to wind up SOL if a bag goes.

 

http://www.sdtrucksprings.com/index....ducts_id=10187

I did find these. However the shady description doesn't instil confidence.

 

Looks like the ttc-1210 are stock height with 25% increase.
ttc-1210l are +10% with 2" of lowering.

I was thinking about an airbag kit as well.