[vlxjim]

If I were you I would get a mating 7 pin round plug. Cut the straight 5 off and strip and screw the wires to the right pins. As for the brakes you should have surge brakes . How surge brakes work is when you push on your brakes the trailer will push up on the hitch ball and that will push the tongue of the trailer that has a master cylinder in it. That will then send hydraulic pressure to the calipers hence slowing you trailer. The trick is to make sure that the reverse lights are hooked up so that when you back up you trailer the brakes are lock out from braking. If not backing up is real hard.