Yes, door ramps can support heavy weights, but their capacity depends on several factors including the material, design, and construction quality of the ramp. Ramps are typically made from materials like aluminum, steel, or reinforced plastic, each offering different levels of strength and durability. 
Aluminum ramps are lightweight yet strong, often supporting weights ranging from 600 to 800 pounds, making them suitable for wheelchairs, scooters, and some light machinery. Steel ramps, on the other hand, are heavier and can support much greater weights, often exceeding 1,000 pounds, which makes them ideal for industrial or commercial use where heavier equipment might be transported.
The design of the ramp also plays a crucial role in its weight-bearing capacity. Ramps with a solid, non-folding design generally support more weight than those that fold or have multiple sections. Additionally, the width and length of the ramp can affect its stability and weight capacity; wider and longer ramps tend to distribute weight more evenly, reducing stress on any single point.
Construction quality is another critical factor. Ramps with reinforced joints, non-slip surfaces, and sturdy handrails provide additional support and safety, allowing them to handle heavier loads more effectively. It's essential to ensure that the ramp is installed correctly, with secure anchoring to prevent movement or tipping when in use.
Before using a ramp for heavy weights, it's important to check the manufacturer's specifications for weight limits and ensure that the ramp is suitable for the intended use. Regular maintenance and inspections can also help ensure that the ramp remains safe and functional over time.