Why would you want to start adding "helpers" to your suspension without knowing the condition of yours first? If your truck is a 2007 that is a lot of years on springs if they have been heavily used. The guy at the spring shop told me he gets a lot of trucks with a cracked leaf and people don't even notice. He said it often cracks at the center pin where it is hard to see. I just had a leaf added on my truck and I was surprised my truck actually had a better ride with no load. I have not tried it with a load yet. It does sit a little higher.
I would start with a good spring shop before anything else.
I have a 2001 Dodge Ram 2500 with the overload spring. I think it is part of the camper package in my year.