Gee, sorry Greg! I don't have the chrome B unit though, that's Rex Ammerman's, he will make one for you! He did a neat one with noses on each end! Sure hope I find a speeder, did not know the trailers were scarce. Got it on ebay, only bidder.
Well I have the motor car( speeder) that I bought several years ago. Matter of fact I should have a second one somewhere. Jerry how about a pic of the trailer as I never have seen a MDC trailer car. Later RJD
Here is a photo of the trailer. Mine is a bit beat up, and it has a permanent job propelling the Rail Beetle (Sorry Jerry!).
But take heart Jerry. Now that Piko is making some of the Roundhouse large scale cars, perhaps they will bring out some of the powered units as well. The Piko motors would be more suited for the voltage requirements of large scale than the original Athearn HO motors were.