Yep thats normal. Sometimes mine look like they are as much as 2-3inches in difference and it does worry me but i heard thats it's fine. Im sure it wears down your tires faster though. I leave lovely black marks all over the road when i reverse my trailer in every day.
What type of axles do you have? and do you have leafs or torsion?
What type of axles do you have? and do you have leafs or torsion?