larry,
combi says sometimes the wheels will get out of sync and the way to get them to realign is to put the unit in carousel or side travel mode and turn the steering wheel all the way to the right, then back all the way to the left, then back all the way to the right and that should get them to realign.
So from stop to stop right, left then back right.

If the wheels keep getting misaligned frequently then one of the steer cylinders has bad packing in it and should be repacked or replaced or there may be some linkage worn out or damaged.
Usually the cylinders are the problem though.
There is a slim possibility that one of the wheel change over diverter valves is leaking by internally allowing the wheel to drift out of alignment.