1.
Merely for reason of using own weighbridge & transport vehicles - while transporting goods - cannot be 'sole' reason for blocking of credit under rule 86A.
It appears that ITC is blocked on the ground that ITC is availed without receipt of goods.
And as per Section 155, where any person claims that he is eligible for input tax credit under this Act, the burden of proving such claim shall lie on such person.
So, person availing ITC needs to prove that subject goods are actually received by him with corroborative evidences (which can be from the end of supplier of goods and at the end of recipient).
One needs to go through contents of order issued u/r 86A (1) and also, see available evidences (i.e. any addition to having own weighbridge & transport vehicles), before commenting on actual defence strategy.
These are ex facie views of mine and the same should not be construed as professional advice / suggestion.