I think CJ at Thorparts has that on his SOA. I think a few others have also. I have seen CJ's H3 in person flexing to hell and back so I would not worry about it. Hope you don't mind but you do know it will make a little stiffer ride right? Both the add a leaf and the ARB leafs are a little stiffer than stock. To give you an idea the difference; I sometimes pick up a skid of metal for work at 1,000 lbs that fits in the back of my H3. When I had the stock leafs it hung down about -5 to -10 degrees from a +5 to +10 degrees rake when the weight was added. Now I go from +5 to +10 degrees to 0 degrees with the truck sitting flat when the weight is added. Not a huge difference but its something.