From Starbounder - Starbound Wiki
The Jeep is a vehicle that can be found in certain bounty missions. It operates similarly to a hoverbike, but there is no controller module for it, so it cannot be taken with the player or repaired.
During the beta, the Jeep was a vehicle that could be summoned by beta-era tech. The tech that summoned it was removed from the game, while the vehicles itself was left disabled in the game assets.