I took the trailer to Akron (200 mi round trip) last weekend with two tractors on it and the brakes worked very well. I had to turn the controller down to 5 to keep from over braking. I put the 7000# backing plates on all 4 wheels, and rewired the trailer including lights. The rebuild cost about $500, including LED lights, new e-brake control and pigtail.
Thanks for the advice.