That could be true and I'm not saying its not. I know quite a few people in both two wheel and four wheel racing from my previous job's. I worked with a guy that RG was at his wedding and knew him and the family really well. Even the guys dad raced with RG's dad back in the day. So my sources...
Take the ground off the trailer and wire brush the connector and trailer. Make sure it's down to bare metal. You probably have rust there and it's giving you a bad ground.