Horse and cart quirk

[Otto von Blotto]

Hi All, I have just notice a small quirk in the game, I have reported on the matrix site and would like ask here if anyone else had noticed this, I can't belive I have been playing the game this long and only just noticed.

Horse and carts if carrying troops that can move by themselfs 82mm mortars, light AT, inf, 75mm guns etc can be double timed and fatigued but ones carrying heavy equipment can't?