I also second Darryl's recommendation of the Twin Dolly by SolidGrip Systems. I am using mine on a cooking show, traveling around Portugal, using an F3 with Optimo DP lenses, mattebox, kinomatik shoulder rig, onboard monitor, it works great, very fluid motion. It is an essential piece of my kit. I have been using a 2mt truss as track, and also the 1mt twintube track as slider. It is very fast to setup and the dolly is rugged and well built. It takes any load you throw at it. I have a 150mm ball bowl for the bigger cameras and heads, now I have been working with a 100mm bowl head (Sachtler Video 18) and the f3. But I have used it with a RedOne and Optimo 24-290mm and O'Connor 2575 Head.
I have mounted the track on iced lakes, mountain rocks, dirt roads and it always performs flawlessly.
Thanks Onno for a very good product!
PS - I do not work for SolidGripSystems, nor do I have any financial interest in it. Just a happy costumer :)
