When I bought Homer the Super Bus, all 4 CV Boots were bad so I bought a set. 5 years later Homer would start and stop at random making a hammering noise from the rear. Sometimes it would hammer fast and loud and go until I slowed down or stopped, sometimes it wasn't as bad and it would stop on it's own but usually when it stopped, it would be when I hit a bump or pot hole. After a 6 months of this (including a trip to Tampa, FL) I figured out the CV joints were worn out and the hammering was the axle sliding back and forth, banging and bounding off the flanges.
So . . . I got a new set of joints and pulled those new 5 year old boots out of the cabinet and fixed the problem. Here's my main advice . . . once you have figured out what the problem is and buy the parts to fix it with, you might as well go ahead and do the work. If you wait too long, you'll probably have to buy some more parts to go with what you already had and the job will be even harder.
