Some lower quality CD players have a hard time reading burned CDs. It should still be able to play a disc burned from MP3's though. If not, there is likely an issue with the burned disc, or the CD player.
Try playing the CD when the truck isn't moving. Lower quality CD players will often skip real bad when playing burned discs.
Try playing the disc in another CD player.
If the disc plays in other CD players, try cleaning the disc.