The inventory is ~98% accurate, with only a Forklift assembly missing, one substitute mold, and no stickers.

=MISSING PARTS=
1. https://rebrickable.com/parts/45707b/forklift-forks-wide-reinforced-with-rubber-belt-holder/
2. https://rebrickable.com/parts/4518c/forklift-mast-wide-1-x-2-hinge-plate-locking-with-rubber-belt-holder/
3. https://rebrickable.com/parts/47998/plate-special-4-x-4-with-clips-horizontal/

=MISSING DECALS=
1. https://rebrickable.com/parts/13616/sticker-sheet-for-set-60020-1/

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

=LEGO.com DESCRIPTION=
Source: https://web.archive.org/web/20130822002552/http://shop.lego.com/en-US/Cargo-Truck-60020

"Load up the LEGO® City Cargo Truck with opening side panel and roof spoiler, plus forklift truck, sack truck and accessories!"

Ages: 5-12
Pieces: 321
Price: $39.99

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

This set no. 60020 'Cargo Truck' came out in 2013 as part of the CITY's "Cargo" subtheme.

Within CITY, it was only a second generation of "Cargo," following the debut 2008 line-up. However, LEGO first used a similar logo as early as the mid-1980s—occasionally featured on freight boats, trains, and cargo containers. The series never got an official name (unlike, for instance, Octan) and went on a lengthy hiatus after 1995. (See a timeline on Mecabricks below.)

The 'Cargo Truck' was a direct successor to one of the 2008 "Cargo" sets, a 'Truck & Forklift,' but with notable changes in every item of the build:

>>FORKLIFT
Generally very similar to the 2008 model, an upgraded Forklift became slicker, with a driver now protected by a one-piece 6x4x3⅓ Roll Cage (part #64450 introduced in 2009, hence unavailable for the "Cargo" 1st-gen build.) The cabin also incorporated a mini antenna as the forklift control, in addition to a steering wheel.

The forklift assembly in the 'Cargo Truck'—a Vertical Hinge Plate #4518c + Reinforced Wide Forks #45707b—was a third-generation (2013-2018), which utilized a rubber belt (instead of a metal spring). Sadly, all these molds are missing on Mecabricks.

>>FLATBED TRUCK
The truck, essentially, shared modular three-axle chassis with a fleet of CITY service vehicles introduced in 2013: Cement Mixer, Octan Tanker Truck, Garbage Truck, etc. Like the 2008 car, the new Cargo Truck had a driver's cabin mounted on a 6x6 plate. However, the expanded flatbed now carried a slightly longer, 6x16 detachable container.

Without a Trailer, the 2013 "Cargo" model transports fewer goods, with two 4x6 pallets carrying fuel tanks and a V4 engine.

>>MINIFIGURES
The expanded crew featured two minifigures in the Truck, male and female, in a blue overalls uniform and red hats. The forklift driver came with a brand-new headgear: a curved hat (part #11303) with attachable headphones (#14045); both just debuted in 2013.

The accessories included a walkie-talkie, a coffee mug in the Truck's cabin, and a standard hand cart.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

=MORE 'CARGO' SETS=

7733: CITY > Cargo > Truck & Forklift (2008)
https://www.mecabricks.com/en/models/1w2rEQBVa8W

7732: CITY > Cargo > Air Mail (2008)
https://www.mecabricks.com/en/models/6mLvzdrg2Aw
by @Sebsan21

7731: CITY > Cargo > Mail Van (2008)
https://www.mecabricks.com/en/models/907vNgyVaAm
by @Sebsan21

4555: Trains > Cargo Station (1995)
https://www.mecabricks.com/en/models/X1k2qr5XjE0
by @Superdooperhero

4549: Trains > Container Double Stack ('91)
https://www.mecabricks.com/en/models/PkaJR31ZaxM

6375: Town > Airport > Trans Air Carrier (1990)
https://www.mecabricks.com/en/models/8bJ2bmGmayB
by @Batka

6361: LEGOLAND > Town > Mobile Crane (1986)
https://www.mecabricks.com/en/models/nKZvmAGLvG6
by @e_maze

6391: LEGOLAND > Town > Cargo Center (1984)
https://www.mecabricks.com/en/models/JV2yXLkKayQ
by @awesomo