Problem with my H2 SUT Hummer

[DanF]

I have recently put on 22 inch XD Rockstars with 325/50/22 Nitto Terra Grappler AT Tires. All seemed well they look great except I have an issue when i try to turn the truck fully, whether making a 3 point turn or a U turn, the wheels seemed as if they were hitting the truck and nearly not allowing the car to go any further. I tested to see if the tires were infact hitting the truck by putting it in park, spinning the wheel fully and seeing if there was contact; no contact was found.

What could the problem be? Are 325/50/22 the wrong size tire?

Thanks in advance - Dan