Member forces due to a load on deck

Hi all,

I am currently trying to develop a Grasshopper-Karamba model and analysis for getting the member forces in beam or truss due to the live loads on deck. It will be a bridge model.

I have already the two main girders with the transverse beams connected to those girders for the substructure. I have also the truss members for the superstructure above the deck level assembled into the substructure below the deck level.  

I am looking for a way to properly model the deck such that I can apply a concentrated force at any place on the deck as the live load. In the end what I want to get is the member forces on both the girders and trusses due to that moving concentrated load on the deck.

My questions:

1. How should I model the deck? Can I model it as a brep or mesh with segments?

2. How do I model the connection of the deck to the transverse beams? 

3. Should the deck be meshed to segments so that the moving load can be applied iteratively to any nodes where the edges of the mesh intersect? Or is there a better way?

Modeling shell in karamba is new thing to me. Moreover integration of elements such as this case. Would appreciate any suggestions.

Thanks for the help in advance.