Interstate '76 was a vehicle combat developed and published by Activision and released in 1997. The game is set in the Southwestern USA in an alternate History of the year 1976, in which the 1973 oil crisis was never resolved. All the in-game vehicles in Interstate '76 are based on real cars, including many period American muscle cars with Big guns, rockets, motors, and more awesome stuff screwed onto their roofs. I think A Interstate 76 mod would fit beamng very well working gun models are already in some mod cars implemented the only thing it needs is a pack for all cars and The Me262 mod has nice rocket models which is beneficial for that purpose
