Round profile of webs and chords are used as an example. It is simple changeable with Revit Truss properties edit command.

Example of parameters from one family:

Type W102_TCH102_VW102_DW102_BCH102 Analytical Vertical Projection Angle 0.000° Assembly Code BCH h 102.000 Cost Description DW h 102.000 End Release 1 Framing Member Girder Keynote M_Truss_SchType 120 M_Truss_Type 360 Manufacturer Maximum Span 11000.000 Minimum Span 9000.000 Model Overhang End 600.000 Overhang Start 600.000 Pitch 25.000° Start Release 1 Structural Framing Type HSS101.6X3.2 T4R_Created by www.tools4revit.com T4R_Version 2011.12.28 TCH h 102.000 Type Comments Truss Height 2098.384 Truss Length 9000.000 URL VW h 102.000 Web Orientation 0 Webs have symbolic cutback True