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)
-
#Steam AliasWL%Streak
- 1.45967.873+1
- 2.776130.857+1
- 3.351180.661+6
- 4.396210.653+1
- 5.327117.736+4
- 6.12357.683+2
- 7.325146.690-1
- 8.856232.787+3
- 9.333131.718-1
- 10.735445.623+2