Hello Rob,
Here is what I found in TM from the Belgian Army (1946).
It seems there 3 kinds of limber :
*caisson de pièce (the one hooked to the gun)
*caisson avant de section
*caisson arrière de section
All the tools were protected by a canvas cover.
https://i.imgur.com/ZtQnD3Q.jpg
https://i.imgur.com/enh1i73.jpg
https://i.imgur.com/Yf7Mq2e.jpg
https://i.imgur.com/3bA52eo.jpg
Hope it helps,
Cheers from France,
Patrice.