By all accounts the 'mudguards' over the wheels were not all that well made and one broke off during one mission. The vehicle was still usable but the astronauts ended up getting covered in dust.
So, replacement guards should be made of carbon fiber which is stronger and lighter.
One thing has always bugged me about the lunar rover and that's the tiny little dish antenna, it doesn't look big enough and anyway how did they keep it aligned with either earth or the command module, both of which are moving relative to the moon.