Long ago, for a KSP challenge, I built: The Pentagon Series mk II
The mk II has just enough V-delta to reach Mun orbit (from the surface of Mun), the 6 wheels give it plenty of traction (and speed ), the pentagon-shaped cabin needs ridiculous impact speeds to be destroyed (Kerbals tend to fall out much sooner though), the "reaction wheels" give it enough torque to correct any driving mishaps, the docking port on the bottom makes attaching to a carrier easy, and last but not least, the 4 parachutes allow for safe landing even in the thin atmosphere of Duna.