I have no experience with the never fail bushing, but I can say the bronze bushings and wet bolts are excellent. One word of caution, when installing the wet bolts, be sure the small grease outlet hole in the bolt is oriented at the 3 or 9 o'clock position. My trailer came from the factory unable to take grease in 2 fittings. Pulled and reoriented and now takes grease easily.
Dexter EZ-Flex is a good choice, but I would also look at MORryde for a solution.
The EZ-Flex does not come with a wet bolt. Try to find one. I got one with my MORryde X Factor suspension support.