You never know what you may see when you go for a drive in the Park. That would be Burnside Industrial Park (bearing little resemblance to any real Park, except for a few spindly trees.)
Last Saturday I spotted this old R model Mack, with a strange axle spread.
On closer investigation it appears that the rear axle is an add-on tag axle. Even then the drive axle looks oddly close to the cab. No doubt it was built for some specific purpose, but it is now just another old tractor.
The R model was introduced in the early 1960s and had one of longest (if not the longest) run of any truck model. [1965-1990]