I have a 2017 F350 towing a 28' International with a Propride. Before the F350, I was towing with an F150 and using 1400 lb bars. I exchanged several messages with Sean at Propride about ordering lighter bars for the F350. He told me to just stay with the 1400 lb bars and back down the amount of load I'm dialing in with the jacks.
This is what I have done, only doing a little bit of weight transfer. I'm sitting level, no porpoising, rides well in the truck, everything is riding well in the trailer, no popped rivets, no sign of stress. I couldn't be happier with how this turned out and really thought I'd have to downgrade the bars.
Also, even with the high hitch receiver on the newer F350's, I was fine with adjusting the stinger down to the lowest level so no need for a bigger drop.
Hope this helps and enjoy your F350.