Like many a startup company Westfall came up short on money to make their product a success and ultimately sold out to Paccar (formerly known as Pacific Car and Foundry) and better known for their Carco winches and Kenworth and Peterbilt trucks. Here, however, straight in from a collector in New Zealand is a photo of a nicely restored Kenworth log skidder...
VanNatta Log Skidder History and engineering
This guy has a large website that has lots of pictures and good writing about logging in the Pacific Northwest.