Compliance is the most critical factor. Ensure the vehicles meet WVTA (Whole Vehicle Type Approval) for Europe, DOT/EPA standards for the US, or GCC certification for the Middle East. Key technical checks include braking systems (ABS/ESP), airbag configurations, and charging interface compatibility (Type 2, CCS2, or GB/T) for electric vehicles. It is essential to request the Certificate of Conformity (CoC) and VIN (Vehicle Identification Number) documentation from the supplier before finalizing the purchase.