Vanilla Vehicles 2 has some weird things happening, and although I try to fix everything I can, some things are either out of my hands or just things that don't depend on me, here are some common issues that maybe help you understanding a bug you have or just something wrong.

-I can't enter any of the vehicles of your mod.
PROBLEM: This is a steam / Unturned mod and not really a bug from the mod, this happens when your version doesn't match the version from the server (due to the last Hotfix that modifies every .dat of the mod, the server won't let you enter the cars so there aren't any desync happening inside the server)
SOLUTION: Basically you have to update either your client version (the one that your computer has, this can be done by unsubscribing and then subscribing again to the mod, with the game closed), or your server version, I recommend grabbing your client version and just manually copy that version onto the server workshop folder so you're 100% sure you've got the latest version.

-Weird Console errors
PROBLEM: You could be either getting this
Failed to generate an item with ID 36116 from type Fire [6]
Failed to generate an item with ID 36114 from type Fire [6]
Failed to generate an item with ID 36115 from type Fire [6]
Failed to generate an item with ID 36113 from type Fire [6]
Failed to generate an item with ID 36111 from type Fire [6]
Failed to generate an item with ID 36111 from type Fire [6]
Failed to generate an item with ID 36112 from type Fire [6]
Failed to generate an item with ID 36114 from type Fire [6]
Failed to respawn an item with ID 36117 from type Fire [6]
Failed to respawn an item with ID 36111 from type Fire [6]
Failed to respawn an item with ID 36110 from type Fire [6]
Failed to respawn an item with ID 36110 from type Fire [6]
Failed to respawn an item with ID 36114 from type Fire [6]
Failed to respawn an item with ID 36110 from type Fire [6]
Failed to respawn an item with ID 36114 from type Fire [6]
Failed to respawn an item with ID 36115 from type Fire [6]
Failed to respawn an item with ID 36110 from type Fire [6]
Failed to respawn an item with ID 36112 from type Fire [6]
Failed to respawn an item with ID 36112 from type Fire [6]
Failed to respawn an item with ID 36115 from type Fire [6]
Failed to respawn an item with ID 36113 from type Fire [6]
Failed to respawn an item with ID 36115 from type Fire [6]
Failed to respawn an item with ID 36112 from type Fire [6]
Failed to respawn an item with ID 36117 from type Fire [6]
or this
Value cannot be null.
Parameter name: key
at System.Collections.Generic.Dictionary2[TKey,TValue].FindEntry (TKey key) [0x00008] in <9577ac7a62ef43179789031239ba8798>:0
at System.Collections.Generic.Dictionary2[TKey,TValue].TryGetValue (TKey key, TValue& value) [0x00000] in <9577ac7a62ef43179789031239ba8798>:0
at SDG.Framework.IO.FormattedFiles.KeyValueTables.KeyValueTableReader.readDictionary (System.IO.StreamReader input, System.Collections.Generic.Dictionary2[TKey,TValue] scope) [0x000fe] in <709efb15d2694b9c9b6949f762d9f3e7>:0
at SDG.Framework.IO.FormattedFiles.KeyValueTables.KeyValueTableReader..ctor (System.IO.StreamReader input) [0x00019] in <709efb15d2694b9c9b6949f762d9f3e7>:0
at SDG.Framework.IO.FormattedFiles.KeyValueTables.KeyValueTableReader.readDictionary (System.IO.StreamReader input, System.Collections.Generic.Dictionary2[TKey,TValue] scope) [0x00124] in <709efb15d2694b9c9b6949f762d9f3e7>:0
at SDG.Framework.IO.FormattedFiles.KeyValueTables.KeyValueTableReader..ctor (System.IO.StreamReader input) [0x00019] in <709efb15d2694b9c9b6949f762d9f3e7>:0
at SDG.Unturned.Assets.loadFile (SDG.Unturned.Assets+ScannedFileInfo file) [0x0001e] in <709efb15d2694b9c9b6949f762d9f3e7>:0
EXPLANATION: Neither of this errors in the console do any harm to the server itself, they are just weird errors that appear and but don't mean anything in game (tested a lot of times), The first error is just a particle error with the Seajet (that I haven't really got the time to try and fix) and the second one I don't really know.
Basically there's no solution available right now but there's also no problem on it existing (other than maybe being a bit annoying)

-Some cars just don't spawn or idk wtf is going on.
PROBLEM: Pretty self explanatory, for some reason you're not able to spawn vehicles (or they just don't spawn naturally, same thing)
SOLUTION: As of now we know of 2 mods that collide with VV2, first being the most obvious, Vanilla Vehicles Remastered (VVR) as this is the continuation of VVR, it's obviously not going to work with it as it uses the same ID's AND GUIDs, so you can't use them both, as you may guess I recommend you to use VV2 as it's the same mod just better and expanded.
The other mod that collides with VV2 is Leprechan's Vanilla Vehicles (THIS SHOULD BE FIXED, 03.05.2021) (https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1209917653).

-"Your files are missing a custom asset (36xxx) this server is using"
PROBLEM: You can't enter a server because of this, probably.
SOLUTION: The server you play on has a more updated version (that added new vehicles) than you, so you're basically missing the 3d models of those vehicles, go to the workshop and unsubscribe and subscribe again to the mod.