is
True when the vehicle can reach the task's pickup and has room for the load.
Room belongs here, with reachability, and not in a bidding rule. This class's rule is that feasibility is a fact and everything that is a judgement about desirability belongs elsewhere; a full vehicle cannot take the task in exactly the sense that an unreachable pickup cannot be reached. A capacity-one fleet is unaffected: every idle vehicle has room.