first thing if you have wear on the inside of the tyre you are in need of a whl align,secondly have a good look over ya front end,get someone to shake the wheels top to bottom and side to side on each wheel while you look at the suspension\steering,and check for any play and thirdly yes the tyres can flat spot if they have been sitting for long periods with the weight of the truck on them,they can come good but it takes a little while on the road