Sitting here waiting on tires being put on the truck.
If you tow a trailer - you may get want the check out Timbren rubber springs - they help distribute the weight.
I buy mine at Summit Racing.
I had a set installed on my 1999 F-250 and they worked well.I also had a set installed on the 2015-F-250 and i had to have the rubber cut down.I fail to see any spring action in them and the last pair have no give at all! If i wasn't old i would up grade to air bags! Look before you buy,but i find very little give in solid rubber! Bud.
I use the term “ spring “ to reference the orientation rather than the action of the Timbren product.
My truck had a factory camper option which utilized the same Timbren rubber design but were worn out after (22) years.
The rubber compresses with the trailer tongue weight - it is not really a spring - but I have used them on other trucks and they do help with sway and ride performance - plus they are maintenance free.
I had these installed in my daughter's 2016 4Runner. She has a 'Vet Kit' in the back, and when it's stocked it adds about 450#. In her case the extra weight means they are in constant contact with the rear axle. She likes them, helps smooth the ride, helps keep the vehicle level, and reduces rolling on turns.
I have airbags on my truck because I need to vary the assist because my load varies widely, but if you have a fairly constant load (or if you have no load, than had a fairly consistent load) the Timbren's are a great way to go.