transport designations?

On the subject of fleet ID decals, I'm thinking seriously of expanding
the sheet
to twice the size, hopefully to fit even insane-sized fleets.

If I've got the space, I might as well add transports and the like. 
So...  Can
anyone tell me what good designations would be for the following?

Heavy Freighter
Medium Freighter
Light Freighter
Free Trader
Fleet Auxillary
Assault Transport
Bulk Carrier
Starliner

Thanks

Tom

--
Thomas Pope
Human Computer Interaction Institute
Carnegie Mellon University
http://www.cs.cmu.edu/~tpope