Glad that the Project 41 Quad Mount stuff was useful. That Project 48 6x6 was an interesting adaptation with very advanced 'body work' for those years. With a little development, it would have been a good combat support vehicle (being lower and potentially more tractable than the 4x4 CMP while quieter-running than the Universal Carrier).
My sense is that the poor overseas assessment of the 6x6 sprang from the usual cast of reasons:
1 - In their urgency to contribute to the war effort, the ATDB jumped the gun (no pun intended) and sent undeveloped prototype conversion gun tractors to the UK for testing;
2 - The British Army was already anticipating domestic designs to their own specs (and, from experience, Whitehall will have known that it would end up funding further Project 48 development);
3 - First Canadian Army strongly favoured British- or US-built equipment ... so we can add in the usual colonial neurotic self-loathing here
Another thought is about RW access to the Thornton rear bogies. As Canadian distributor, these would have been the go-to for H.V. Welles. The question is: Was there surplus US capacity for these units?
Of course, none this need be of any concern for What-If. Eg: replacement bogies could have been designed. John Inglis might have offered the entire Project 41 Quad Mount engineering for sale overseas after WW2. Eg: if Australia bought the project, it might have been redesigned for a modern chassis instead of that obsolete Ford 4x6. Heaps of potential follow-on development there
... Hope you and your family are well Stephen during these crazy times!
Cheers Rob. All is well here ... although we're swamped with tourists on "essential travel" trips
I trust that you and yours are well too!