Cambodia (Time to process: 15 minutes)
The immigration and customs offices are on the right-hand side of the road, just before the border gate. Absolutely no problems here.
Thailand (Time to process: 20 minutes)
Pass through the short no-man's land, and enter the Thai customs/immigration area.
The immigration office is on the left-hand side, while the customs is the first building on the right.
No computer printout form was issued for the truck - only the Carnet document was utilised.