Don't know if anyone noticed but the E-Z flex ETI uses on the TA's has Zerk fittings on it. Guess at some point we have to give em a shot of grease. Couldn't find anything on Dexter's website pertaining to maintenance on them.
Another thing, you can replace the hanger bolts with their wet bolts if you start to go through the plastic bushings. The wet bolts come with brass bushings. I had to replace them once on my Starcraft, started eating tires when they were very shot.