If you don't want lift your options decrease but still lots of options.

Add A Leaf or adding in Ram 1500 leafs will lift the truck with a harsher ride. I have Ram 2500 leafs, so will coil over shocks.

Stock did come with HD spring like stated before but your going to have a hard time finding one.

Best option is Air shocks. They are adjustable cheep and easy to install. It is a shock that you fill with air from a schrader valve like a tire. Here is one kit. 1,000lbs extra carrying capacity.

https://www.napaonline.com/Catalog/C...(P_RecType%3aA)

I have the monroe air shocks, I love them!!


Also is all the towing helpers like air bags/springs that add above your stock springs, same concept as the air shocks.
Like this one. http://www.jcwhitney.com/ride-contro...299d412y1993j1

Tons more at www.jcw.com or www.summitracing.com or www.airbagit.com

Also helper springs that add on to your stock leaf springs. Lots of different styles.
Here is one. http://www.jcwhitney.com/loadpro-adj.../p2005983.jcwx
www.jcw.com or www.summitracing.com www.Autozone.com