Hi! Thanks for having me in the group. I have a 2012 Nissan xTerra 4x4 and I regularly tow a +-3600 lb travel trailer (loaded weight) with a WDH and stabilizer bars. I noticed lots of sag, and then I found a broken leaf spring. I don't do much real 4x4ing (rough roads are a regular occurance). I want to replace the leaf springs and make my suspension stronger and better so it won't sag when I tow. If I put new leaf springs on, will I still need helper springs? I replaced the rear shocks 2 years ago. WHat do I need to tow my travel trailer without sagging and breaking stuff? Thanks!