Trimble Link for Civil 3d works, if you have a number of "extra" files. We use the Trimble Survey Controller for our GPS stuff, so transferring it for observations is pointless.
The majority of our field collection is with TDS.
How did I determine how, Good question. I tried for 20 minutes to search the newsgroups, but I can't find it. It was a short, two or three line comment buried somewhere that mentioned the TDS is a Geodemeter format.
I've tested it on a couple of projects and got it to work. The screen captures I sent you are from the 2nd time I did it on the attached files above.
I've also spent some time with Trimble asking them to "fix" the lack of support in Trimble link for a division of Trimble. It was Trimble support that told me that the format is different and that TSC 7 and above works with Trimble Link.
If I find it I'll send it too you.
Matthew Anderson
Civil 3d SP3
Matthew Anderson, PE CFM
Product Manager
Autodesk (Innovyze)