Some Vermont possibilities for Ward & Dickinson diners need to be checked out.
Thomas Walsh of Albany was running a business in Rutland, VT in 1930 when he declared bankruptcy. One of the companies who was listed as a creditor was Ward & Dickinson of Silver Creek, NY
Edit - was in town for three years
A While back, on EBAY was a matchbook for Pete's Diner in Middlebury, VT. This had a drawing of a larger 40 foot Ward & Dickinson. A Deluxe model, so to say. The drawing of the Ward Diner, the 30 foot model is often a stock art option, but I am hoping that the larger 40 foot models used for drawings are good hits.
Edit - This has been confirmed! Diner was demolished shortly after WW2
One of the places using the 30 foot Ward diner was located in South Carolina. I was able to verify that the diner looked to be a home made barrel roof diner, put into place in the mid 1930s.
Finally. I had always found a mention of a Chunawaka Lunch Car, run by the Petty Bros in Granville, NY around 1930. I recently found a June 1933 blurb that William Lorette was moving the diner to Rutland. I always had a suspicion that this might be a Closson or a Ward.
Edit - Need address, but William Lorette did have a restaurant in Rutland.