Brakes on any vehicle are sized to the axle their on.
A 7000 lb trailer axle = 7000 lb of braking performance.
Same with the tow vehicle.
A one to DRW with 9900 rawr and 6000 fawr = 15900 lbs of braking performance at a minimum.
A triaxle trailer/7k axles = 21000 lb of braking performance.
Now add the trucks 15900 lbs of braking performance = 36900 lbs of braking performance.
As someone mentioned the trucks brakes stops the truck and the trailer brakes stops the trailer. If they don't then there is a reason why...but its time to get them fixed.
