[landtank]

I'm sure you are aware of the fact that you're under in caster with that setup and the fact that you have 37s on it only increases the problem.

For checking the rubber bushings I usually use small pry bars right next to the bushing and really work them over. It takes a lot of force to get near what they are seeing from a moving truck. Also, since I've seen you wheel first hand Slee's blue bushings might have cracked similar to the OME yellow ones on trucks that see a lot of twist. You might have to drop the arms to see that.