We were always running nose high and occasionally dragging the tail of the trailer. About two years ago, after dragging the rear hard enough to break one of the slide gears, I decided that was enough. I had seen a post about trailer blocks, so I went to their site,
https://www.trailerblocks.com/ , and decided to purchase their 2" block kits that come with new 9/16" u-bolts and plates. The price is deceiving because it shows Canadian Dollars, so the price in US Dollars is less. Install wasn't too difficult, and the trailer now rides level. The bigger impact of getting the rig level is how much better it handles. The axles are also now equally loaded, so I'm sure tires will wear better too. This is the install before cutting off the excess bolts.