really? it gives your powerstroke an issue?
I recently hauled home 14 5x6 rolls on my gooseneck.
I've got a 99 F450 with the 7.3PSD with a 4.88 rear with a locker...
she didn't even know I had a trailer hitched...
I've pulled 14k behind her.. a full e350 stretch conversion van back on my gooseneck. pulled it down the interstate doing at least max legal speed when a buddy broke down in ga one night. she burned a lil extra diesel... and pyrometer needle pointed straight up.. but that's about it.
in both instances, properly adjusted brake controler ( prodigy ) had no issues assisting stopping the trailer.
you sure your brakes and controller are adjusted correctly?
On your power stroke.. you aren't using a tuning chip are you? perhaps had it set to economy?
Is this a 7.3 or 6.0 PSD
what's your rear end? somthing speedy and weak like a 3.73 or low and strong like a 4.88?