I have P275 60R 15 on my truck and like the earlier poster, I believe they could be similar in size. As to the lowering, the truck is definitly lower in the back, because the rake is not the same as a stock height truck. My truck is lowered 4" in back and 2.5" in front, and that leaves about 2" of tire/wheel well gap in both the front and the back. In my opinion, It still has more rake than this truck. Indicating the back of this truck has been lowered more than the front, but it still maybe a 2"x4" drop. My 2 cents. If nothing else, stop in and ask the owner.