Porpoise sledges were towed by the tanks that needed the ammunition in them, and anyway, they did so with simple crossed tow bars:

(source)
Not the best photo, but the best one I could find, and you can see the tow bars are fairly thin and not at all like the thing on the BARV.
					
(source)
Not the best photo, but the best one I could find, and you can see the tow bars are fairly thin and not at all like the thing on the BARV.

							
						
 The only good pictures of the thing you can find, are of preserved vehicles like this one, which doesn’t help at all with figuring out what it’s for. However, I’ve written e-mails tonight to both the REME Museum and Bovington to ask if they can shed some light on it.
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