Anyone using a ballast box trolley with a heavy box?

Hiya,

I have a Portland filled Deere ballast box with the extension filled right to the top. Currently I'm using a heavy duty oak furniture dolly with 6 steel wheel casters on a polished concrete floor. It works OK but the wood does flex and it makes moving it difficult.

I'm wondering how the trolley works with the heaver ballast boxes.

Thanks in advance,

Tom