overload springs 02 f350 2wd

I posted this in t/c I'm new to this today. I Purchased a 11' camper and found out after the fact the previous owner removed the stock overload springs from my f350 and lowered it 2"by putting after market hanger on the front of the rear leaf spring. my plan is to replace the hanger with oem add hellwig 3500 overload springs and put the air bags on as well I will be towing a 4 horse trailer along with the camper I did manufacture a tie down and tow system that meets or beats the one from torklift . I'm looking for any info and knowledge any of you have I am new to this