I'M GOING UP SIX ALL THE WAY AROUND! AND RUNNING 35'S FOR THE LOOK'S THE HEAVIEST THING I'LL BE HAULIN IS PROBABLY GOING TO B A BOAT DO I NEED HELPER SPRINGS OR WHAT I DON'T WNAT THE ASS END TO SAG WHEN I GOT THE BOAT BEHIND ME LIKE YOU SEE WITH THESE LIFTED TRUCK'S SQUATTING GOIN DOWN THE ROAD I DON'T WANT THAT.

THANKS ZACK 

add a leaf or 2 or 3 in rear,,, u wont get any sag.  

Depends on how heavy your boat is and if your truck is a 1/2, 3/4, or a 1 ton. If you do need helper springs they are very easy to install, I installed them myself.