I am not sure..
I did look on the RMV website and found this about undercarriage neon..
May I use neon undercarriage lights?
No, Neon (fluorescent) lights are illegal and are not approved for use in Massachusetts. Any aftermarket lighting that is not SAE or DOT approved shall be removed.
I would say that if the lights are DOT or SAE approved they won't say anything..
To be safe I wouldn't put anything on the truck to attract attention until you are over 18 at least..LOL
Don't want to lose your license after waiting so long to get it.. Especially over something minor