A cargo handling system configured to load and unload a cargo container (130, 131) with respect to a cargo holding area of a vehicle, the cargo handling system comprising: roller tracks extending from a floor, wherein the roller tracks are separated by a clearance space, and wherein the roller tracks include rollers that are configured to rotatably support the cargo container (130, 131); and a mobile cargo mover (200, 300) that is configured to move within the clearance space, wherein the cargo mover (200, 300) is configured to engage the cargo container (130, 131) to move the cargo container (130, 131) on the roller tracks, and wherein the cargo mover (200, 300) is configured to disengage the cargo container (130, 131) to move away from the cargo container (130, 131); a traction sub-system (500, 600, 700) that is configured to allow the cargo mover to exert tractive force into the floor, wherein, the traction sub-system comprises: one or more gear wheels extending from a main housing of the mobile cargo mover; and one or more gear tracks secured to one or both of the floor or roller tracks, wherein the one or more gear wheels are configured to engage the one or more gear tracks; and/or the traction sub-system comprises: a plurality of first teeth (602, 606) alternately separated by a plurality of first gaps (606, 608) of at least one conveyor of the cargo mover; and a plurality of second teeth (606, 602) alternately separated by a plurality of second gaps (606, 608) formed on the floor; and/or the traction sub-system comprises: one or more traction couplers that extend from the cargo mover, wherein the one or more traction couplers are configured to abut into an underside of the cargo container, wherein the traction couplers are spring-biased posts, columns, studs or protuberances that remain in an extended position in relation to an upper platform of the mobile cargo mover. roller tracks extending from a floor, wherein the roller tracks are separated by a clearance space, and wherein the roller tracks include rollers that are configured to rotatably support the cargo container (130, 131); and a mobile cargo mover (200, 300) that is configured to move within the clearance space, wherein the cargo mover (200, 300) is configured to engage the cargo container (130, 131) to move the cargo container (130, 131) on the roller tracks, and wherein the cargo mover (200, 300) is configured to disengage the cargo container (130, 131) to move away from the cargo container (130, 131); a traction sub-system (500, 600, 700) that is configured to allow the cargo mover to exert tractive force into the floor, wherein, the traction sub-system comprises: one or more gear wheels extending from a main housing of the mobile cargo mover; and one or more gear tracks secured to one or both of the floor or roller tracks, wherein the one or more gear wheels are configured to engage the one or more gear tracks; one or more gear wheels extending from a main housing of the mobile cargo mover; and one or more gear tracks secured to one or both of the floor or roller tracks, wherein the one or more gear wheels are configured to engage the one or more gear tracks; and/or the traction sub-system comprises: a plurality of first teeth (602, 606) alternately separated by a plurality of first gaps (606, 608) of at least one conveyor of the cargo mover; and a plurality of second teeth (606, 602) alternately separated by a plurality of second gaps (606, 608) formed on the floor; a plurality of first teeth (602, 606) alternately separated by a plurality of first gaps (606, 608) of at least one conveyor of the cargo mover; and a plurality of second teeth (606, 602) alternately separated by a plurality of second gaps (606, 608) formed on the floor; and/or the traction sub-system comprises: one or more traction couplers that extend from the cargo mover, wherein the one or more traction couplers are configured to abut into an underside of the cargo container, wherein the traction couplers are spring-biased posts, columns, studs or protuberances that remain in an extended position in relation to an upper platform of the mobile cargo mover.