Early production Ram II and Kangaroo?

[sapper740]

I've had this picture sitting on my hard drive for a while now and figure it's time to ask your opinions of what might be taking place here. The tank in full view behind the Churchill ARV is obviously an early production Ram II ( auxiliary turret, tool box on fender etc.) I'm not sure what the two large boxes above the engine compartment could be..perhaps experimental wading trunks? Another question, just nosing in from the right appears to be a Kangaroo made from a late production Ram II, or perhaps, even a Sherman. Your thoughts gentlemen?