Tavel Trailer springs and shackles

Unless you are putting a lot of miles on the trailer, most of that stuff should last almost a life time. I think the brass or bonze greaseable bushings would be the best way to go. Jack up a wheel at a time and give everything a good shake and check for any excessive wear every year or so. Make sure to grease it regularly and if any bushings dont take grease, try again with the weight off that joint or clean or replace the grease fitting

How many miles do you put on these bushings? I think most of us are still running on the plastic bushings without any real problems. Since you already once replaced the bronze bushings I wouldn't give a second thought.

If it is certain ones that always give you a hard time those bolts may have been installed with the internal grease holes slightly off horizontal. The fix is to reorient the bolts which can also be a pain job.

Just under 10 thousand on the set and still tight. Replaced the original plastic bushings that were no longer complete circles after about 2600 miles. Also replaced the solid equalizer with one that has rubber in it to take the shock out of bumps. I grease all the fittings about every three thousand.

 I guess I'm old school. If you have bronze/brass bushings that can be lubricated, I would stay with them. I've had 2 trailers with the white nylon/plastic bushings that wore out and were replaced with the bronze bushings with the zerk fitting bolt. Messy, but they last a long time and do the job. 

I never had good luck with nylon/plastic bushings in any trailer I have owned. My present 5th wheel has  the original brass bushings and is 19 years old. I jack up each side by the frame to lube each zerk every spring. This way the zerks easily take grease. We normally travel 3-5000 miles a year. If we travel more then that I will lube it a second time.