I had everything checked. My truck IBC was checked twice from the dealer. They claim it works fine. Its not the break controller we tried it on another truck with P3 and did the same thing level 10 no load could not get them to lock up. The trailer needed to be replaced defective. CornPro did not stand behind there trailers. This thing was not even a Year old and about 150 miles on it. I had it looking newer then when i got it. Dexter said they would just keep replacing everything tell we got to the problem. I don't have time to keep driving it back and fourth trying to figure it out. I already had to spend close to $300 out of my pocket for this thing. SoundGuy I'm not trying to screw anybody. I wanted CornPro to take trailer back and give me my money back. As a safety issues i would have taken it back and tore it apart to find out whats going on to make sure other trailers are not like this. They would not do that. So the dealer said he would take it back and try to fix the problem and sell it get me my money back.