chassis 11 and a cab 33 mounted on chassis 11 at the front of truck vehicle 10 chassis 11 comprises various components including a frame an engine a suspension front steered road wheels 11 a and engine driven rear road wheels 11 b on rear tandem rear axles which collectively form a road operable truck vehicle for adapting the cab chassis to a waste collection vocation a waste collection body 12 is mounted on chassis 11 rearward of cab 33 body 12 comprises an understructure 13 and various panels such as panels 14 cooperatively defining a waste collection space 16 a hopper 17 having a hopper opening 18 in the top of body 12 toward the front of truck vehicle 10 and a discharge opening 100 at the rear of truck vehicle 10 body 12 comprises an upright rectangular rear frame 101 see fig2 which surrounds discharge opening 100 a tailgate 20 is pivotally mounted on rear frame 101 to swing about a horizontal axis 41 at the top of rear frame 101 a motive means such as hydraulic cylinder assemblies not visible in the drawing views are connected between tailgate 20 and rear frame 101 the motive means operates to swing tailgate 20 from a closed position fig1 2 and 3 to open discharge opening 100 allowing collected waste to be pushed out of waste collection space 16 through discharge opening 100 when waste collection space 16 has been emptied the motive means operates to swing tailgate 20 downwardly to re close discharge opening 100 body 12 further comprises a front loading container pickup mechanism 21 having a left.