[anijet]

Hi learning,

The bucking you mentioned, is it traveling along a road with expansion joints? This is typically called chucking and can be helped with a varity of hitches and/or pin boxes. I finally eliminated most of the chucking with an AirSafe air ride hitch and a Demco Glide Ride pin box.

As far as the brakes, it sounds like the emergency disconnect pin was pulled which will apply full brake force from the trailer battery until the battery drains or the switch/pin is reset.

The 250 will not be rated by Ford for that much weight. It will pull the trailer just fine but stopping and stability will be marginal. If the trailer has disc brakes, that will help. If it has electric brakes, I would upgrade the truck. Also, make sure you are not exceeding the weight limits of the tires. The chassis and axles will usually carry more than they are rated for, but not the tires.