There are lots of options, 60,000 lb plastic rolls of steel, 80,000 lb hollow logs, styrene "I" beams, or it could be loaded with a stack of AMT flatbeds, but then they would need to be arched too.....oh well. I have a balsa wood concrete beam on my Ertl stretch trailer. I prefer lowboys, and the load of choice is a 80,000 lb styrene D8.