Thanks! The wood trailers are indeed the same as the metal ones. There were 30 manufacturers of these trailers in the US with many small coach and trailer companies having contracts for only about a thousand. Many of the companies made wood body ones. There are some parts that are singular to one type or the other, but many other parts are interchangeable and the same parts catalog covers both types.
I also forgot I had this image from IWM in the collection already:
https://g518parts.com/wp-content/gal...H_028473_1.jpg
Caption reads "No. 14 Power Trailer" and was dated 31.3.43
Matt
