The twin wheels on the Mk 3 is an item that the Mk 1 dearly needs! With only single wheels of the main undercarriage it imposes too many operating restrictions,
The problem with having twin wheels on the Mk.1 is that you immediately hit operating restrictions in terms of the Mk.1's home base, which oftimes are ships as small as a Frigate. To maneouvre in the tight comfines of a ship of that size requires an undercarriage that can castor on a helo that big, you don't get that with twin wheels. So there is a good reason for that single wheel main UC, even if it restricts the helo in terms of other ground environments like rough and/or grass. . . .As far as I can see all the Italian aircraft of whatever flavour have twin wheel mains, but even their ASuW ones are land based where it's not an issue, and even if they go to sea it'll be on ships like the Guissepe Garibaldi where moving them around won't be an issue.