It is just an alignment issue, When the tires wear on the outside that is called positive camber, if it is on the inside of the tire it would be negative camber. Toe in or toe out can be checked by rubbing your hand across the tire and back if it was...
I have an 08 dodge with a 5.7 hemi dually with an artic fox 990 and the ride is nice and sway I really don't notice and get 8 mpg going 70 mph. I have added air bags and rear sway bar.
