Bridge Layers and tank transports

[K K Rossokolski]

I doubt very much if this a new question, but is it technically possible within JTCS to simulate something like the Churchill Bridgelayers? I know of two types..the girder bridge which hung out in front of an AVRE, and the Ark, a chassis which drove into the creek and lowered its bridge down on top. DG included some bridgelayers in the OObs but these were eye candy only without function, as I recall.
And is it possible to simulate tank transporters, such as the mighty Diamond T M19/M9 prime mover/trailer combo? I believe we can now carry boats on trucks, (ie transport carrying transport) which seems to be similar in principle.