To supplement the informstion from Charlie M. There is a drawing with a D&RG file number, a portion of which is attached.
From the 4 foot wheel base truck shown, and the information shown on the folio shet for these cars in "Rails Around Gold hill"
My guess would be that they rode on ASF trucks similar to the Boxcars
I can only recall seeing two photos of these cars in service. One is the postcard below
The other is being held for the publication of an upcoming book and is not available for posting at this time.
For those interested in the Cripple Creek area I highly recomend this site
www.cripplecreekrailroads.com
There is also an excellent drawing of the cars by John Robinson from measurements raken in 1967. This may be available through Coronado Scale Models
Coranadoscalemod@aol.com
Hope this helps some.