Rob,
Exiting find! Well done on the recovery to put it in a safe place.
As far as I can tell, this is a 4.2-in mortar carrier. Apart from the stowage, the angle iron steps at the sides are a sign of this variant - read more
in this thread.
In December 1944 a total of 266 T16s were held by Canadian Units in First Cdn Army 21 Army Group - see the page
THE T-16 CARRIER in use with the Canadian Army in my
T16 Universal Carrier webpage.
HTH,
Hanno
