From what I have researched, Ford Has highest rated front springs available but also the most variations in spring rates. I am not convinced you need additional spring capacity on the front since most campers add little weight to the front of the truck and most unload the front axle a little. I feel you get the most out the front end by changing to an adjustable damped shock and adding a larger stabilizer bar. What you can do for free or very little cost is weigh your truck axles at a truck stop and adjust your tire pressure based on the load inflation tables for your size tire.
Although there is plenty of good advice, it does come down how your setup feels for you and none our advice should be taken as absolutes. It took me about five adjustments to make my previous truck comfortable and safe while my current truck only needed one.
