to the op ....congrats and it's amazing how that fix's soooooo many towing problems lol I used to have a 35' ( total length ) bumper hitch toy hauler, rated 1/2 ton towable by forest river..... towed with an f250 diesel ext cab long box with tow package ( tow package doesn't mean crap btw) I front and rear sway bars and 1k lbs stronger coils on the front and air bags in the rear and a 12k lb load leveling hitch with 2 sway brakes and shocks on the camper also re tq'd axle nuts and rebuilt the sway bar bushings with wet bolts.... better .... but still did similar to yours did, no matter how it was set or loaded. I finally tried putting 500 lbs up against the ramp gate behind my sand rail and that helped a bunch. my point is they can claim 1/2 ton towable all they want, but I think they tested those on 40 mph roads in a straight line with no wind lol and to those that pull these and say they have no problems....great glad to hear it and glad your happy but your idea of under control and tows great is waaaaaay different than mine and many others. I WILL never own another bumper hitch that long ever again. I went to a fifth wheel toy hauler on that same truck.... night and day diff and picked up 1 mpg at 70 mph!!
'99 f350, quad cab long box, dually, 6 speed manual, gently mod'd.
2011 wolf pack 295 with full susp now!