Hey guys Found this while I was looking for something else. Take a moment a read this it may be very important information that you may someday need. www.sherline.com/lmbook.htm#refrn23 When you go to the link it comes up in the middle of the article. Go all the way to the top and start reading. Yes, the company that wrote it does sell a product for trailers but the information is very informative and important.