Ford or Chev

I have a 2012 (2011 running gear) E450. I have spoken to a couple of truck alignment centers and they said to not do anything to the front ends if they are driving ok. I was having some wander with mine, was going to install new sway bars and shocks again they recommended not to. Anyhow I increased the rear airbags to 65-70 psi, run the front tires at 65 and the rears at 75. Made a world of difference. So it seems it takes some experimentation to get it to drive the way you want it. I may still go with bigger/better sway bars and shocks but it has dropped down on my to do list.