Yeah you may be right. I am accumulating all the gear that I would need for this new travel trailer and then I'm going to head to the scale and then do a test run and then if I experience any sway, I'm going to head to Menards and pick up some of those sandbags and just make a whole entire day of it until I get it right. I went ahead and I bit the bullet and just bought the Hayes electronic sway control. It couldn't hurt and there are not many reviews on it the few that there is are very good. For a couple of hundred bucks it's a small investment for a little added peace of mind and safety.
