Glossary entry (derived from question below)
English term or phrase:
undertrucked spot scenario
Portuguese translation:
situação com poucos caminhões no local; cenário com falta de caminhões no local
English term
Brazil
Experienced and reliable translator
Native in: Portuguese 
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English
undertrucked spot scenario
configured near the load unit, and the truck payload system:
• The truck GPS is detected as “arriving” at the load unit – the truck crosses a geofence near the load unit, and the truck is detected as slowing down
• In an undertrucked spot scenario, the truck is the only one present at the load unit - spot time is from arrive timestamp to the truck payload system detecting the first bucket of material placed in the tray
• In an overtrucked spot scenario, the truck arrives at the load unit, but another truck is currently being loaded. Spot time begins when the truck ahead is fully loaded, to the truck payload system detecting the first bucket of material placed in the tray
Jun 11, 2021 12:10: Matheus Chaud changed "Edited KOG entry" from "<a href="/profile/83285">Lilian Magalhães's</a> old entry - "undertrucked spot scenario"" to ""situação com poucos caminhões no local; cenário com falta de caminhões no local""
Proposed translations
Brazil
IT Specialist • M.A. in Linguistics
Native in: Portuguese (Variant: Brazilian) 
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English, and 1 more.
situação com poucos caminhões no local; cenário com falta de caminhões no local
Pelo que entendi ao ler seu texto e também algumas referências:
spot time = tempo gasto (pelos caminhões) no local
undertrucked = com poucos caminhões, com falta de caminhões
overtrucked = com excesso de caminhões
Isso tudo é com referência ao número ideal de caminhões para otimização da frota.
Referência:
https://www.ivolve.com/introducing-haulage-trucking/
Brazil
15y eng, chem, fin, bus, law PTEN
Native in: Portuguese
Works in: English to Portuguese, Portuguese to English, Portuguese
situação com ausência de outro caminhão
Especificamente nesse contexto, me parece que, o caminhão é o único a estar carregando no local - the truck is the only one present at the load unit -, apesar de a expressão "under(truck)" em si claramente denotar menos, ou falta de de caminhões.
O segundo caso seria uma "situação com a presença de outro caminhão".
Brazil
32 years engineering/law/contracts
Native in: English (Variant: US) , Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English
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