I've not had any issues with my xt276. On a long downgrade the big thing is to NOT let the towed load 'push' the tow vehicle.
Sometimes it's best to use your brake controller to apply the trailer brakes only without applying the tow vehicle brakes. More braking applied to the trailer than the tow vehicle will aid in maintaining control.
Just my experience from towing mobile homes up to 16' wide and 85' long in my younger years.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.