If you look at the right front wheel on the Cybertruck it is barely touching the ground. Not what you want towing a Trailer. The Super Duty wheels are solidly planted on the ground and the Truck is almost level
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The weight on both vehicles is the same. Both Trucks are driving in a straight line, One Truck is nose high with the front wheels barely touching the ground and the other Truck is solidly planted on the ground with the exact same weight on it.
The sled is connected by a chain, there is no weight on the trucks at the start and they all sit level until the torque from the rear wheels reacts against the hitch attachment resulting in unloading the front wheels. Rear load is dependent on connection point height, chain length, and pulling force.
The Cybertruck's air suspension results in additional rake due to the pull not lasting long enough for the rear shocks to air up for the load. If they had preloaded the chain, aired up, and then gone, it would have stayed flatter (but front would still lift).
Rivian experiences the same thing.
The Lightning is standard suspension and the front lifts at the start of pull.
The F350 has non-air suspension and 5k payload capacity, so it squats less and its front heavy center of gravity helps counter the lifting moment.
From a weight on tires point of view, the squat hurts traction.
Connection:
Pre-pull:
Rivian (also air suspension) :