I hear that poly is the way to go, but have yet to re-do mine since the rubber is still ok. Ureathane bushings should not really change any noticeable action of the suspension, only give better feel due to elimiated mushyness.
Before replacing trunions make sure yours are bad. Often I have found that there is one more turn that can be taken , tightening the assembly with out causing a bind. the factory ,having NEW bits to work with only assembled them to an appx. tightness. If one more turn gets you down into new threads without causing a bind in the turning, all you lose is some room inside where excess grease used to sit. One would think from the cost that the new trunions are a good product,I dont know. I ordered some once but they were back ordered so long I gave up & saved $$
I know it sounds crude but its worth a try (unless the steel shoulders are badly worn)
MD(mad dog)