I'm not asking because of the boat. As a new marching band dad I've begun towing a couple of different school band trailers. These are 22', 9K lb. GVWR, tandem axle trailers but which are just under 7K fully loaded (we loaded them up and took them to the scales to be sure). This is within the published ratings for the truck but not by much. Power for towing and stopping seem to be fine (the trailers have electric brakes and I installed a Tekonsha P3 controller), but rear end sag is more than I'd prefer. IMO the trailer mfr. placed the axles too far back, so that when they're loaded the tongue weight is much more than it should be.
Since they aren't my trailers and I'm not the only person towing them, any mods to them are out of the question and weight distribution is probably not a very good option. So for the first time I'm looking into adding a leaf, air bags, etc., and wonder what experiences or advice the members here have. I'd prefer to install something and forget it, and not have to inflate anything or do other maintenance. And I'd like to not destroy the ride quality for the 97% of the time I'm not towing. I realize these features may be mutually exclusive.
Edit: Anyone have
these?