I only have a 1500 and went with sumo springs. They sit about 1 1/2 " off the axle and dont engage until about 200 lbs put on the rear. Stock ride is unchanged.
Timberlins I heard too many complaints about hard ride. These are better material thats softer and progressiveness is better from my readings.
But I noticed great handling and can take hard turns with no roll. Its amazing really.
Hooked the RV up to test WD with sumos and now I get very reduced sag.
These are the 1000 lbs units @ 50% compression.
I thought about the supersprings, thats like an add a leaf, but that would affect unloaded ride too much for my liking.
This is one of the best investments I have made for my truck.
Got them at sd springs and found a coupon code online for 15$ off. Total was $153 bucks.
3 year warranty.
About 700lb TW.
Edit.
Oh here is the before sag.