Because the front of the Jeep and engine are over the rear axle of the bus, it shouldn't be too bad. The length of the bus and the engine in the front of the bus are more than enough to counterbalance the rear of the Jeep, which probably weighs less than the shell of the bus would have. That was probably a 50 or 60 passenger bus, so the potential passenger load would have required a frame and rear axle that would have been more than enough to support the weight of the Jeep. I'm guessing the interior of the bus has been converted into living quarters, so the weight there would be minimal.