Hi, Robert - it sounds to me, from looking at the walkthrough, that the truck automatically arrives when you have done everything you are supposed to, so perhaps you are missing an action that triggers the arrival of the truck.
Have you done all of the following?
Trash collection: Check the sign and letters in the letterbox right of the gate. It states that the paper wastes are picked up first; followed by the biological wastes. The bulky stuff are picked up tomorrow.
See the paper waste picked up the truck. The security camera pans to the truck.
Examine the orange bio bin, blue paper waste bin and the bulky trash bin. Pick up the carpet on the bulky stuff bin.
Divert the security camera: Examine the wall right of gate. Use the carpet on wall and Sam will say to wait because of the security camera.
Examine the kerb stone in front of the gate.
Move the orange bin to the kerb stone - away from the wall that Sam checked.
Few minutes later; the trash collector truck arrives
You could also try restoring to an earlier save point and play this section of the game over - hopefully that won't be necessary. Good luck!