If you ignore the capital cost (and the development costs) then the running costs of an airship should be lower than a super helo.
Road transport can easily handle the proposed 50 tonnes (though at great expense if it is an indivisible load), and, of course it requires a good quality highway.
There are fixed-wing aircraft capable of carrying 50 tonnes - but these require airport runways (and road transport connections at either end).
So we are left with 'inaccessible' transit locations at a cost possibly less than a super helo.