Off-road vehicles are typically powered by diesel engines, sized to cover the highest peak loads in their dutycycles. Such engines can be downsized, using hybridization to supplement engine power for short periods. However, many applications are low-volume and specialized, making it impractical to deploy heavy engineering resources to optimize every one. For this reason, manufacturers tend to produce maid-of-all-work vehicles to cover every situation. This paper demonstrates the benefits of custom hybridization for specialist applications. It also introduces a simulation tool to benefit OEMs who seek to provide custom low-volume vehicles based on common platforms. The simulation tool is a fast, low-cost, cloud-based software package under development at ZeBeyond, provisionally named "ePop Cloud". It allows many different architectures to be evaluated rapidly at the product planning stage, and can be quickly set up and used by engineers who are not specialists in simulation. An agricultural load case is analyzed, showing the benefits of adding hybridization through motors, ultracapacitors and batteries, supporting engine start and accessories while supplementing engine power for demand peaks. The use case for a Fendt diesel tractor was taken from Götz, T., Korb, L., Bosch, T., & Bernhardt, H. (2025), Agricultural Load Cycles: Tractor Mission Profiles From Recorded GNSS and CAN Bus Data, https://doi.org/10.1016/j.dib.2025.110009. The results show benefits for a flexible hybridization architecture customized to specific use cases, and the benefits of quick, accessible analysis tools for small engineering teams, to support early product decisions and what-if analyses.