Good conditions to keep RED fairly cool I suppose?

I have to agree. We've got BeSteady One and running it with BMPCC and GH4. BeSteady limits you to 2kg and that's huge advantage. I went to test DJI gimbal and it was really heavy and no way you can use it for whole day unless you have few operators to carry it around. From the experience from few shoots already if you don;t want to break your back try to get as lightest rig as possible.