Carrier profile · USDOT 1998035 · Updated Jun 13, 2026
DOUGLAS L TREFZ
1 power unitONAKA, SD50/100
AUTHORITY STATUS UNKNOWN
Operations & Lanes
Where this carrier actually runs, revealed by roadside-inspection geography over the last 24 months — not where they claim to operate, shown as state-level inspection density.
Inspection density by state· each tile = a state · shade = inspections, last 24 mo
Home base
ONAKA, SD
Density
fewermore