Creating Loads in Dynamo Studio

I have created space truss roof in Dynamo Studio. I have a geometry already but I stuck. I would like to add loads to my model but I can’t. Of course I am working in connection with Robot Structural Analysis. I found some examples but all of them regarding 2D models or frames. None of them fit my case. To create the space truss I used LunchBox Package and WireSpaceTruss node. Could you help me? Any examples (files) of space truss model with loads, supports etc. will be helpful or even comments.