might also measure between the tires. just measured mine today and one side is 5 1/2 inches and the other is 5 inches . now i will have to do more measuring and find out wher they are off.

 

My tires were wearing like you mentioned. The camber was off on mine. The shop realigned the axles by putting more of a bend in the axle.

 

with the double axle, arnt the leafs connected between the 2 to equal the load of the axles when the trailer is up in the front? on mine, when i turn a corner the back tires seem to leave half their tread on the street. is this normal when turning?