i just did another today let me go thru a few things
1) in front 295 35 24 on a 3.5 is perfect
2) the ride is very nice for how low it sits since i designed the rear spring rates and many people here have commented on that also
3) in rear you will need to cut off the bumpstop bracket and I include new bumpstops. You can add helper bags to my coils and tow 6000 pounds no problem or throw 8 peopel in the truck will still be fine.
4) if you run no helpers and are loaded up will hit the bumpstops just part of being low but if you use helper bags wont be a issue since truck will stay up in rear.