You don't want the hd springs. They will be very harsh. I have the mediums/regular 2" ones and with a 1000lb load in the bed the truck sits more level than it did before I put the new leaves in.

You mention a block - I would remove it when you put the new leafs in. When I did mine, I just replaced the leafs and everything else was stock (even the shacks) - the truck had a pretty strong rake to it until I put the bj spacers in there and leveled it out. Actually, I chose not to make it completely level and left maybe a slight rake so that when something is in the bed it sits level.

 

wow 1000lbs in a yota!! you puttin that bad boy to the test ha. i carry roughly 500 at the very most. so i guess the mediums will be perfect. the reason for the block is that the front of my truck has a procomp lift, bj spacers, and downey torsions (which i might end up pulling out and replace with stock torsions). with no tb crank. so ill need the block to make up the difference in the rear.

 

that pix is saggy but with no load...only camper