I had RAS on for a while, because I wanted to increase my payload for towing my boat and because at that time I also had a topper with gear. I purchased them because I wanted to first try the cheaper alternative. They increase payload and raise the rear of the truck, I used the larger spacer (40% I believe). Install was easy and the truck felt firmer in the back and did not squat when towing. I would never attempt any serious off-roading or jumping with the RAS, it's not meant to handle that. It is a cheaper alternative if you want to increase payload and for towing. Since then, I have installed Icons on Option #2. The Icons feel even firmer than the RAS, I have not had any of the squeaking or any other issues with the Icons as other have. Let me know if you have any other questions.