What is the fine-grained topic of the following text: All incorporating Euro 6 engines, the trio of 6x6 PANTHERs are set to include a ‘Stinger’ High Reach Extendable Turret (HRET) and rear steer axles to ensure maximal efficiency in deployment and ability. Only return the topic.
6x6 PANTHERs Euro 6 engines and their features