I am a huge fan not only of the super-hero genre, but of the Hero System as a game-system. There's not a system I've encountered that is quite as flexible and comprehensive as the Hero System, and as such, a huge need I found in my campaigns was inspiration and help with building out my vehicles. The Ultimate Vehicle is exactly what I was looking for, especially their section on mechs. I highly recommend this for anyone that is playing even a semi-modern campaign, as there are sections that cover ground, air, water, mecha, and even space vehicles. There's even a section in the back for vehicles-as-characters, which was also just great for inspiration.