I am on the thrid replacement of my rear axle seals. Would the pin weight of my 5th wheel be the cause? I drive a 2006, 2500hd cc Duramax. I tow Jayco Designer 35RLTS. Total towing miles in between first bad seal was at 75k miles, second seal was 7k miles later and then now, 5k miles. My truck is rated to do the work and I am not out of wieghts. Any thoughts?