Well you could try but as I remember it was a singularly unimpressive remodelling of a Transit, which barely moved under it's own steam, and certainly was not 'ocean going' or even 'sea-worthy'.
And as I know from when my dad used to work in TV on this sort of thing, what usually happens is the producers come up with an idea, and then props are made to look like what they want them to on screen, so in this case it is entirely likely that a couple of Transit shells were used, one which was a perfectly regular 'road going' one, with a few bits taped on to make it look like the one used on the water, which had been stripped of all unnecessary extra weight including the engine, fuel tanks, seating, etc etc.
Same was done for the James Bond films where the 'Hero car' was a nice one used only for close-ups, but several identical-looking copies were used for the 'action shots', so they could get bashed up and not be worried about it.
And the same is true for every other instance in which vehicles are used in film and TV.
(Sorry if that ruins it for anyone.)
Particularly 'The Dukes of Hazzard' and 'The A-Team'.
Just watch those to see the amount of 'General Lee' and 'Black Van' examples that get destroyed in each episode.
