You must have had shitty installers, or shitty installs. I've rarely ever had issues with changers skipping, well back in the day when changers were still common. We used to install changers in bass heavy cars because they were less prone to skipping than in dash CD players. Also anything since about 2004 is very difficult to make skip, especially from the bass from the system. The suspensions have been improved greatly and really resist the shocks that were a problem in the '80s and '90s.

Of course now with the digital mass storage ability, using portable players or in car PCs, that is really a concern of the past.