All of our Manufactured Housing anchors, strapping & Hardware are tested to the HUD Code of 4725lbs. for a 3150lbs. working load with a 1.5 safety factor.
There is no such thing as FHA Approved, FHA sets the specs they want met and an FHA approved engineer signs off that you have met them, the same would be true for HUD products.
Getting ultimate holding strength is not that simple. You need to know the length, width, & height of what your holding down first, and then the type soil for the proper anchor. Then you can find the number needed to hold for that wind.