In time-constrained vehicular systems, optimisation of the system architectures with respect to the system resources has a significant impact on the development cost, performance, and reliability of the systems. This paper adapts the state-of-the-art methods to derive optimised system architectures in the vehicular industrial settings, while taking real-time constraints, resource requirements, communication dependencies, and design choices into account. In this regard, the paper describes and evaluates an industrial use case wherein the proposed method is applied to derive an optimised allocation of the system architecture. The paper also presents evidence and validations that suggest the viability of the method and its applicability in the vehicle industry.