First, this is for all likely confusing areas in the new RRG released today, May 28, effective yesterday, May 27.
Secondly, within the RRG it states that ground vehicles and block LOS to minis. It later states that ground vehicles, Imperial Tank, cannot obscure minis and provides heavy cover.
Situation. If I run my minis behind the tank and my opponent cannot see the minis from their leader but is able to utilize the move 1 to re-position them so that the other minis can, can my opponent then shoot at my minis behind the tank with the applied cover 2 or does the tank completely block LOS and you cannot shoot at them no matter what?