My solution was one of the two-wheeled carts meant for toting golf bags, which I bought for a few $'s at a thrift store. I use it for my big Linhof tripod which weighs 45 pounds. One of the nice features of it is large wheels, since it's meant for outdoor use on variable surfaces, and it's built to take a tall roundish load.
It's all aluminum, so not so heavy on its own and collapses for transport.