It's not a bike, it's not a car with low ground clearance and front wheel drive. It's tanks.
Tanks have low ability in overcoming obstacles, poor mobility in rough terrain, a significant speed loss on the trampoline.
What is the law of contradictions works on the tanks. Where should not be - they fly. Where the tank needs to fly, he falls down and gets stuck.
https://youtu.be/VRwYfFgNwg8
When the tank climbs the mountain, there is no inclusion of low transmission, it is just slow going, not changing the load on the engine.