Sorry, yet I can not get to the 13 winners (I must be misreading your "Manson used the same as field/siege guns and the same truck wheel therefore only one extra wheel"). Could you list them, please? Thanks.
Further (to attempt to begin to answer "Why so many wheels?"), other than the limber and cart wheels, surely, the wheels for the field pieces varied to take account of the physics of firing the different pieces as mounted on the (necessary) different carriage trails. (Same for garrison carriages, I gather, though with the difference there would be the expectation they could be fired on a more uniform platform.)
If this is so (and the reduction is not on carts and limbers), how does Manson address the forces of physics?
I have access to d'Urtubie's Manuel; does he explain the change?
Thanks for any help. - R