This crawler I built is fullly land capable and can easily carry one crate as well as two if you are willing to sacrifice its cool af rear doors and it's maneuvering capabilities in water ( yes its amphibious). 1 to detact crate, 2 VTOL to activate amphibious steering capabilities, 3 VTOL to open rear doors. to deliver package, press 3 and VTOL to open doors, then press 1 to drop crate, proceed to drive forward. to activate amphibious capabilities, press 3 VTOL to open rear doors, turn off 3, press 2 to activate amphibious capabilities, steering with VTOL, accelerate in water using thrusts. steering on land Q and E. throttle on land W and S. Enjoy!