Yes this is possible. Relevant part of Page 30: (Declaring Charges)A is in D's front and cannot wheel past D, B is in D's rear, C can draw Line of Sight to D:
After declaring a charge with B against D, can A declare a charge against E on the assumption that D will have to be rotated in order to align the units B and D and thus clear the way?
As long as B's charge is declared first, you are allowed to take into account 'already declared charges'. The second and third steps of the 'Movement phase' are:- Declare ChargesCharges can only be declared at targets that are in the charging unit’s Line of Sight and that the charging unit has a chance of completing the charge against. This means that the target unit must be within the charger's potential Charge Range and there must be enough room to move the charger into base contact with its target. When considering if a charge is possible, do not take potential Flee Charge Reactions into account (not even mandatory ones), but do take already declared charges into account (since charging models might have a chance to move out of the way).
- Move Charges
... so I would say the most common sense reading when considering 'already declared charges' is to think of anything that is described down to the bottom of page 35, including any closing the gap.
But im not 100% sure it doesnt work either.