Please go here (https://truckersmp.com/rules) and read rule 3.1 "Truck Modding" as paint jobs are included in that rule.
In regards to your own custom paint, it will not be allowed in MP If i remember as it would bypass the Excessive save mod rule and the server will Kick you for it.
That looks like you have used a modded trailer in Single player and trying to load it in on MP. Disable all mods in single player if you use them. Load in SP and then retry in MP.
Or you have save modded and accessories added via the save edit is not allowed.
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