Well, the problem is that the difference doesnt scan really well. But I can at least start you off.

So you'll see four varieties of Hat and Can (and there are others as well). Robert E's site has a much more detailed description but the picture=1K words might help too. The Skyline is a CJ, the Fremont is a LCV, and the FQ is a H&C (short cane). Finally the DI is an RHC.