One other thing. As they lower, they move inward. If you are on pavement or packed gravel or rock, this movement puts them in a bind once they start to take on weight. Use Lynx levelers or some other slippery pad to put under them. You'll be surprised at how much they "crawl" once on the ground.
Wright and Penny
2010 Tundra 4X4 5.7L V8
2014 Rockwood 2604WS
Life is a cruel teacher. She gives the test first; the lesson then follows.