A tent system with utility rails is described. The hard shell tent system may include a first shell member, second shell member, utility rails, and an articulating mechanism. The first shell member may be adapted to mount to a roof of a vehicle. The second shell member may be adapted to mate with the first shell member and define an interior cavity when the tent system is in a closed position. The utility rails may be coupled to the second shell member and adapted to support items on top of the second shell member. The articulating mechanism may couple the first shell member to the second shell member and may transfer a weight of the second shell member and the utility rails to a roof of the vehicle when the tent system is in the open position.