This guide will let you know how to load cars in the packer truck in GTA San Andreas.
Open up the Cheat menu and navigate to Spawn Vehicles. Then go to Industrial and tap on Set 1; click packer to summon the packer truck.
After that, open the Cheat menu again, go to Spawn vehicle and then Sevans. Click on Set 1 and then set 2 to spawn two cars.
Drive the car and bring it up on the truck. You will need to enter the truck and press the “end” key to take the ramp upwards. Press the “del” key to bring it down.
Ride into the second car and bring it to the lower deck of the truck.