Dragging the F-150 uphill put a lot more strain on the CT than pulling a similar weight trailer as the coefficient of friction would be at least an order of magnitude greater due to the F150 wheels turning in the opposite direction
Minor correction: it has no impact on coefficient of friction. That’s entirely determined by the materials/surface characteristics of the wheels and the road. The backwards force of friction is determined by that coefficient and the weight of the cybertruck.
It does, however, offer an increased backwards force beyond just towing a passively rolling object.