first tow with 3500lb trailer...when I got my rancho 9000rsX shocks...seemed like I remember alot of you guys running them at position 6 in the front and 4 on the rears with the truck unloaded...so thats where I got them now...question is does anyone rec. changing the rear setting when trailer is attached??? Thanks in advance.

Yep,

I run 5 in the front and 4 in the back when unloaded. When I hook up I run the rear's to 8 or 9. Sometimes I run the front's up too.

Oh sure, I run 8 or 9 when towing. It's easy with the in cab controller.