David
They certainly look like "ditching wheels". A good idea and obviously of some use though these tiny ones would not be much help on a soft bank. You can see similar wheels and rollers on cross country vehicles and machinery going back well before WW1.
That pretty little 6 wheeler looks a much better proposition than the push-me pull-you 4 wheeler. But as Hanno said it was a proof of concept machine experimenting with several different ideas.
Lang
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