About to purchase Firestone ride rites- do i need to lift front?

Im going to order the firestone ride rites for my 07 prerunner double cab for the sag in the rear. will i need to do anything to the front of thge vehicle. lift isnt important just haul alot of stuff for work. I just dont want to install the airbags and at minimal pressure it jacks the ass end up.

INPUT PLEASE

 

im no expert on these but i would say minimal air should not jack it up at all.im sure someone will chime in that knows a little more.

 

I have the Ride Rites on my Tacoma. They do not raise the back with minimal inflation (less than 10psi). It takes 30-40psi to level 1000lbs+. I run 5-10psi without a load and add just enough to level it with a load.