Z71 v.s. Heavy Duty suspension ?

[Knight]

What is the main difference between an 03 silverado ext cab z71 and a 03 silverado ext cab with the tow/trailering Package. and heavy duty suspension?

[SilveradoWV]

I am not for sure about '03 but in previous years a Z71 has larger diameter shocks, high capacity air filter, a couple more skid plates, and the very expensive bedside decals! There is also something about jounce bumpers, but my Z85 has jounce bumpers but not sure if they are the same.

[SirTruckingham]

the z71 has special "off road jounce bumpers" the shocks have a different valving aswell