This issue has not been reported so far, what mods are currently installed on your server?

[CrSk] BMW 525i E34
[Remastered] Arma Weapon Pack
Airdrop-Upgraded
AmmunitionExpansion
Auto Transmission
Banking
Base Furniture Mods 2.0
BetterSuppressors
BuildAnywhere
BuilderItems
CF
Cl0ud's Military Gear
Close/Open Anywhere
Code Lock
DayZ Humanity
DayZ-Expansion-Chat
DayZ-Expansion-Notifications
DisableBaseDestruction
dmns_humvee Fixed
Ear-Plugs
Gerphelius Zil-130
GoreZ
HellRetex Additions : Melee
iBackpacks
Increased Lumens
InventoryPlus
IRP-Land-Rover-Defender-110
LittleQuieter
Mass'sManyItemOverhaul
NoTapeOnGuns
PartyMe
PlantExploitFix
Server_Information_Panel
SIX-DayZ-Auto-Run
SpookArmbands
StreetLightBuilderItem
StreetLighting
Summer_Chernarus
ToxicZone
Trader
Unlimited Stamina
VanillaPlusPlusMap
VPPAdminTools
VPPNotifications
WeaponExpansion
WindstridesClothingPack

If i have time this weekend i will try your mod 1on1 with all these mods to see if it's one mod doing it.

Can not put Canister in slot either. Was having persistence issues as well. but added to events and such so will see.

CF
VPPNotifications
VPPAdminTools
BuilderItems
Increased Lumens
BuildAnywhere
OP_BaseItems
Dayz Navigation
Cl0ud's Military Gear
Base Furniture Mods 2.0
GoreZ
Munghards Itempack
[Remastered] Arma Weapon Pack
WalkingDeadZombies
Mass'sManyItemOverhaul
Code Lock
WindstridesClothingPack
MyDayZ_Dingo
DMNS_Humvee Fixed
Zeroy-FishingZ
IRP-Land-Rover-Defender-110
PartyMe
Unlimited Stamina
VanillaPlusPlusMap
Trader

Canister = Jerrycan

@Rooftop sorry mate but you're wrong <type name="CanisterGasoline">

@RougeSnyper, Any chance you are also unable to put the SeaChest in the DMNS_Humvee?

same thing, i wasn't on about the classname, i thought you may have been doing the same noob thing as i did for 10mins and try to add a gas cannister, with a jerrycan i am able to add from rear with attach and also by using tab and dragging it in, can you do neither of these

Gas Can adds just fine If you ar thinking the Barrel on the roof thats a Barrel though i wish it could be a barrel OR a FireBarrel

https://cdn.discordapp.com/attachments/239590521608208385/650143959963926537/unknown.png

https://cdn.discordapp.com/attachments/239590521608208385/650144495270232074/unknown.png

It's not attaching on our server either. Barrel works fine, sea chests can be attached too, but they can be nicked even if the car is locked (through trader mod). There's just no way to attach the jerrycan to it's slot.

Full mod list:
(WIP) TrailBrozer SUV
[CrSk] BMW 525i E34
Airdrop-Upgraded
Banking Steam
Beetle_mung
BuildAnywhere_v3
BuilderItems
CF
CheckPulse
Code Lock
Community-Online-Tools
DayZ-Expansion-Notifications
DBO_Buggy
DOTZ_Pack_1
DOTZ_Pack_2
Ear-Plugs
FIDOv PACK 4
FlipTransport
Forever_Burning_Campfire
Gerphelius Zil-130
MedicalAttention
MunghardsItempack
Server_Information_Panel
SkinInfected
Sneaky Stashes and Stuff
Summer_Chernarus
TEPBillboardSigns
ToxicZone
Trader
Updated No Vehicle Damage
VanillaPlusPlusMap
Zeroy-FishingZ