The weight capacity limits for loading ramps vary based on several factors, including the material of the ramp, its design, and its intended use. Generally, loading ramps are designed to accommodate a wide range of weight capacities, typically ranging from 500 pounds to over 20,000 pounds. 
1. **Material**: Aluminum ramps are lightweight and often used for lighter loads, with capacities ranging from 500 to 3,000 pounds. Steel ramps are more robust, supporting heavier loads from 5,000 to over 20,000 pounds.
2. **Design**: The design of the ramp, including its width, length, and structural reinforcements, affects its weight capacity. Wider and longer ramps with additional support structures can handle more weight.
3. **Intended Use**: Ramps designed for personal use, such as those for loading motorcycles or ATVs, typically have lower weight capacities (500 to 1,500 pounds). Commercial or industrial ramps, used for loading vehicles or heavy machinery, have much higher capacities, often exceeding 10,000 pounds.
4. **Load Distribution**: The weight capacity also depends on how the load is distributed across the ramp. Evenly distributed loads are easier to support than concentrated loads.
5. **Safety Margin**: Manufacturers often include a safety margin in their weight capacity ratings to ensure safe usage under typical conditions.
When selecting a loading ramp, it is crucial to consider the heaviest load you plan to move and choose a ramp with a capacity that exceeds this weight to ensure safety and durability. Always refer to the manufacturer's specifications for accurate weight capacity information.