I have an 06 f20 with built in ford tow command on my truck. My 07 enclosed carmate trailer keeps popping up with a trailer fault reading, called the dealer they said it was the ford brake controllers were garbage. Hooked the trailer up to my buddies 05 f250 with built in tow command and same problem. I then tried my friends carmate trailer on my truck and it worked like a charm. Funny thing is if my trailer is completely empty the brakes work fine no matter what setting. The second I put some weight in the trailer I get trailer fault reading. Someone told me that mayeb it was because they battery is old but it is only a year old to this date. Any ideas?