Is skid, tread or tire drive better for transporting the camera through the line?
That depends entirely upon line condition. A camera should never be put into a line that is impassable. That is a sure sign that dig-out will be necessary. If the line is greasy, skids may be the best option. This method allows the camera to be pulled through the line form the opposing manhole, and eliminates the need for traction. In cleaner or re-lined pipelines a tractor or skids may be used. Either is an excellent option, and there are numerous wheel and track assemblies in the industry that provide even more options for specific line condition. Many contractors have definite preferences, for various reasons. This is a good questions to ask end-users at the trade show you attend.
