Loose Wheel Bearings?

The pins, and especially the rubber torsion bar bushings on the AG 200 are probably worn out. About 350k is all the bushings are good for, then you need the oversize ones.

Chock your steer tires so the truck will not roll in either direction, release the brakes and leave the truck in neutral. Stand between the tandems, put one hand on the front tire, and one on the rear. Try to push the tires away from each other. Any movement will mean worn bushings. The passenger side will wear the most. The greasable pins, if yours has not been updated yet, are also a point of looseness when worn.

 

There should be some freeplay which seems like a lot when checked at the wheel.

If you have a dial indicator remove the wheel and drum and check the in/out movement of the hub. Most are .002" - .005" clearance.

You might have too much tire air pressure for the load. A common thing since fuel is so costly is guys over inflate tires in hopes of getting better mpg.

You might be doing a lot of high speed driving. Not good for tires either.

Once you get a pattern of wear like that it ain't gonna wear back to normal if you correct the cause.

Your only hope is to find the cause and wait until you buy new tires.

 

To check wheel bearings jack it up till tire will rotate, insert bar into the wheel rim at the top, and lift, a front wheel remove the plug if there is bearing play there will be movement between the brake drum and the backing plate. Lifting further, and movement is king pin wear, that takes two to watch and confirm, lifting farther is the shims or king pin bearing wear. The hub cap has a plug in it, rotate it to the top and remove it if there is metal on the magnet, Buy a full set of bearings and seals.
Rear wheels Jack up one wheel at a time and insert the bar threw the rim and lift, and movement is a reason to remove the axle, and if the oil is contaminated look at the diff plugs, and do a plug swap. Many units have loose wheel bearings from new, and you can adjust them up and retest in a week to see if the bearings are shot or remove and inspect, and replace the seal. Then refill the diff overfull and pre fill the hub. It all depends on what you find and your ability and time.
Abnormal wear, That can be as simple a fix as changing the rotation or a combination of a lot of things, suspension movement being the next thing.
Once the unit has this kind of problem there are so many things to check and repair, it can be an expensive can of worms.

 

Huh? a dial indicator???

I just remember this happening once and it was caused by the tire being low and me not catching it in time. All I did was turn the tire around so the worn spot was toward the inside (center of the duals) and am still running it. If you do this, you will most likely have a funny bounce or vibration for a little while from that tire.