2001 Ford F-150 Crooked Tires

I parked my truck in my driveway the other dayday and and put the steering wheel all the way to the right till it wouldn't go any further. My buddy said the tires looked crooked when I had it parked in his parking lot. I don't have much knowledge on repairing cars and it is hard to explain what I am seeing but I will try my best. Basically the tire looked uneven when all the way to the right. It looked like if the wheel could be turned anymore the rim would be facing on a downward angle rather than straight out. I know I am not great at explaining this but any ideas? I just don't want to pay for a mechanic if its normal. I will upload a photo later. Thanks to everyone for their help.