Les, that shot of QLC pontoon is very interesting!
I had heard that a there was a prototype (up to 6 converted?) QLC with FBE Mk3 trailer; this did not see active use as: a) not as maneouvareable as rigid 6x4 b) as you point out the Tasker semi-permanent coupling made trailer changes impracticable.
Note that the Australians used semi-trailers (but then Australia is a big country!) for Pontoon (without towers), FBE and SBG (I only have standard Conniford images but I am sure you have more!).
David
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