The truck has no canopy. It has several states though:
Model: armies\soviet\vehicles\us6_truck\us6_truck
State machine name: us6_state
Values: base, katyusha, supply
State machine name: supplies_loaded
Values: empty, partial, half, majority, full
These states can be found with the worldbuilder (C:\Program Files (x86)\Steam\steamapps\common\Company of Heroes 2\WorldBuilder_CoH_2.exe)
This has a NIS function which can show a list of states for each model.
Edit: This video might be more helpful than the guide: https://youtu.be/5V62qgEu3Ww?t=428 (7:05 - 9:00)
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#Steam AliasWL%Streak
- 1.44965.874+13
- 2.709113.863+1
- 3.349180.660+4
- 4.332127.723+1
- 5.379204.650+1
- 6.970420.698+1
- 7.323143.693-1
- 8.854232.786+1
- 9.468300.609+2
- 10.325117.735+2