The trailing arms were replaced by Monaco back in 05. Unfortunately, at that time, they were replacing them with basically the same design. I have had them inspected and do not show any stress cracks. The coach only has 30K miles. I do plan to have Source Engineering arms installed this winter when I get to Florida. I will be looking for a facility that has experience with the work and has optical alignment technology. I did read that Henderson's Line Up in Orlando has good service.