Newbie towing question

Honestly, I am a bit embarrassed to say (as a newbie) that I hadn't checked. The truck is all of three weeks old and I put a brand new set of General Grabber ATX tires on the rear for traction if I ever encounter mud etc. So, the tires were running at whatever pressure the dealership and the tire dealer set them at. Now I know better. I stopped by a 4x4 shop this AM and they said, as I have heard from others, that it might be a good idea to put a set of "helper springs" on the rear as that could address some of the squat and make the ride feel more solid and the steering a bit more sure. Since we want to eventually get a camper once we downsize from the fiver, and special rear springs are what is included in the Ford "camper package" upgrade, it strikes me as a reasonable modification and one that isn't too expensive. Certainly won't hurt.