Try back and forth, tighten-loosen, tighten-loosen. the alternating torque will help the ATF/Acetone migrate into the threads. Set the torque wrench to click off so you don't snap the plug off.
The loose wheel bearings can spin the outer inner races against the spindle and wear them too. When you do get to the rebuilding part, check for spindle wear on the bottom (weight bearing side) of the spindles. Replace if worn.
Death wobble is probably bushings, as mentioned above. To check...
Engine needs to be at TDC on compression stroke. Look at the valves, if they are not engaged with the cam lobes and the timing marks on the HB line up you're good to go. If your exhaust valve is engaged with the cam lobe you'll need to come around on the engine 1 turn, based on your pic of the...
My bet is a printed roller will crumble shortly with the loads on it. For best performance ensure the print pattern is circular around the hub, but I still think the layers will split. Might try soaking it with Black Max. Its a softer form of super glue that will provide some resilience.
If...
7 pin mod. With CDL switch in the dash.
We have a lot of sand roads around and here and its common for me to go from pavement to sand and activate the CDL at speed (20-50 mph) but under no throttle load, just let it coast until the CDL engages.
ABS light comes, CDL light comes on, CDL engages...
They're blown.
Do you have a lift on the rig? Have you corrected your caster if the answer is Yes?
Have you checked the Radius arm bushings?
Have you inspected the welds on the Panhard mounts at the frame, looking for cracks?
Have you inspected the frame around the steering box looking for...