how much has my truck been lowered?

[miller6t9]

I bought this just truck, just like it sits in this picture. The previous owner said it had been lowered, just didn't tell me how, and I was too ignorant to ask. I know it isn't lowered much but it does have a slight rake to it. As it sits now (on 235/70/15 tires) there is 30 in. from the ground to the bottom of the fender on the wheel well on the front and 31 in. on the back. There is 17 in from the center of the wheel to the bottom of the fender on the front and 19 in the back. Can anyone figure this out for me?