A delivery system, including a robot and an application of a communication device. The robot includes a tangible, non-transitory, machine readable medium storing instructions that when executed by the processor effectuates operations including: receiving, with the processor, a first location to deliver the one or more items to; obtaining, with the processor, first data of an environment captured by a camera disposed on the robot; detecting, with the processor, at least one object in the environment based on at least the first data; actuating, with the processor, the robot to drive around the at least one object; and actuating, with the processor, the robot to transport the one or more items to the first location while avoiding collision with objects detected in the environment.

A versatile, modular, and stackable four-wheeled mobile platform vehicle includes a chassis having a substantially flat deck and an in-built compartment for housing battery module(s). The vehicle includes a steering assembly with a steering column configured to be selectively used in a first configuration, a second configuration, or a third configuration. The vehicle further comprises a relatively flat suspension system, and attachment provisions provided on and around the chassis for removably attaching one or more attachments to transform the vehicle into one or more useful vehicle types. The chassis allows mounting of seat(s) in multiple seating configurations. Further, each of the four wheels is motor-controlled, and is coupled to the chassis to support the chassis for rolling on a surface using a pair of control arms.