Eric is correct the MWS does not have truck rout limitations, and I have not seen it as a high priority feature request. I have never done it, but it is feasible that you could get the routing from NavTech, and use those as Routing points (you can have up to 50 in a single rout call), and send those into the MWS affectively routing around the non truck friendly segments.

I'll check with the product team and see if this is on the roadmap, we did just implement real time traffic, so that may be helpful to you since avoiding traffic is also a major concern for drivers.

Thanks,

Mark - MSFT