No. It is designed specifically for tires and includes a warning to that point.
Essentially, the load is designed to be carried in a circle directly over the casters, which of course is represented well by tires. Any loads concentrated between the casters or in the center of the dolly will cause the flexible deck to distort excessively and may cause a failure that could result in injury or worse. 55 gallon drums have a diameter much smaller than the caster ring and therefore they concentrate weight away from the casters. This resulted in some significant damage to the deck in extended testing.
So please enjoy using this product for its intended purpose. We are hearing some great stories out there from users who appreciate how easy it is to move displays around and for those who are simply using them to retrieve product from warehouses and showrooms.