The most critical factor is the Load Capacity, which must exceed the weight of the heaviest vehicle intended for use (typically 3,000kg to 5,000kg for residential and 10,000kg+ for commercial). You must also verify the Platform Diameter, usually ranging from 4.5m to 6m to accommodate standard wheelbases. Ensure the drive system uses a Pin-Gear Drive mechanism rather than friction drive for better durability and smoother rotation. Additionally, the Platform Thickness and material (typically Hot-Dip Galvanized Steel) are essential for preventing corrosion and structural warping.