Consider to follow if you like what I do.
Fire extinguisher and jerry can for your scale truck. I made this for my Scx10 8x8 Maz-537 project. Video below.
Zerwiz in the comment section indirectly recommended I scaled the jerrycan so you dont have to do it.
The casing is rotated too.
Old Info: Very important you scale down the jerry can width from 20mm to 15mm or else the can will not fit the case.
Use support on the fire ex top and the jerry can. You dont need to use support on the case if you have good cooling