OP Here. Thanks again for all your responses and suggestions.
Yesterday I installed a pair of Roadmaster Active Suspension on the truck, and today I re-measured and re-setup the equalizer weight distribution system. It was way too tight and the trailer coupler was way too low, and after thinking about it the truck was at a pitched down angle backed to a level trailer when the dealer installed it which would explain why it was setup so low. Its now adjusted so the loaded front axel clearance is about 1/8 inch higher than the unloaded clearance, and the trailer is level on the ball.
Unloaded, truck drives Beautiful with the RAS and I can turn corners MUCH faster now, no body roll at all. Overall I gained a hair under an inch of lift in the back.
Took it on a towing test about 90 miles on the same highway that gave me problems, the fresh newer pavement "harmonic" bounce is very minimized and nearly non existent at 55-60MPH. Whats new is that on normal "bad" and "rough" road, the truck now bounces a lot more when the trailer goes over it. I also think I got a little better gas mileage, around 9MPG according to the factory gauge, had barely seen much over 8.2 before, sometimes down near 7. How much of this was due to increased load and "squish" on the tires due to collapsed leaf springs is hard to judge of course.
I think my next thing to tackle will be the factory shocks with 30K miles on it with some Rancho RS9000 (due to the adjustability) hoping to minimize the bounce some. Some of the more violent bounces on the truck actually get a few up and downs off the front suspension.
Second change, since the camping season in Iowa is coming to an end shortly, I am hoping to get 1 more winter out of these "wonderful" p rated tires Ford installed with their "maximum tow package" and then get some LT tires on it next spring.
2016 Jayflight 29BHDS
2015 Ram 2500 Laramie Crew Cab - 6.4 Hemi
2013 Ford F150 Supercrew EcoBoost, MaxTow (Loved and Sold)
Equal-i-zer Weight distribution system