Some do hate it lol I went out to a cf85 tractor and trailer on the m3 once. DAF aid told me the owner of the company was on his way there with another truck to get the trailer as it was an on going fault and had been recovered twice and in the workshop 3 times. I got there all the warning lights were on put the lap top on it and one of the can networks was at fault. It's one we call v can 1. It dose the engine gearbox tacho and ebs ecu's. I went to the bulk head un plugged the through connection measured the ohms into the cab then down the chassis there should be 60 iver side or 120 plugged in ohms was ok then checked the voltages on the high and low they were out. A tracker had been wired into the v can and was putting a funny signal on it. Snipped it out truck fixed the boss was not happy when he got there lol