Compliance is the most critical factor in mobile catering. You must verify that the supplier can provide CE, EEC, or DOT certifications depending on your region. Specifically, ensure the electrical system (sockets, circuit breakers, and external power inlets) matches your country's voltage (e.g., 110V for US, 220V for EU/AU) and carries UL or SAA listings. Additionally, confirm the water system includes a standardized 3+1 sink configuration (three compartments plus a hand wash sink) and NSF-certified plumbing if you are importing to North America.