Installed all new calipers, brake pads, bearings, seals. CHECK BEARINGS, RACES EVERY 10,000 MILES!!
If trailer is pulled every day bearings should be replaced every 30 to 50 thousand miles!!
Torque the wheels after 50 miles of leaving the shop driveway!!
Keep an eye on grease in the hubs as well. I added a little gear oil to the hubs as well.