Effective collaboration in remote and high-stakes environments such as lunar rover missions requires robust communication, clear role structures, and reliable decision-making protocols. This paper introduces a collaborative environment called RoleQuorum VR and analyzes how immersive technologies and structured interaction mechanisms influence collaborative performance. Using a within-subjects design (N=72), we evaluated the effects of shared visual context, collaboration modes (VR–VR vs. VR–PC), and a structured voting system on decision accuracy and team coordination. Participants worked in teams to complete simulated lunar rover navigation tasks under four interface configurations. Measures included task success, rover damage, task workload, usability, and coordination. Results indicated significant effects of task conditions and suggested a tradeoff between system complexity and rover safety: structured VR–VR interaction reduced rover damage but increased workload. By integrating role-based collaboration with quorum mechanisms, this work advances VR-supported collective decision systems for space exploration and other mission-critical domains.