Hello & welcome. Sorry I don't have an answer for you - but maybe this reply will prompt someone smarter than me to reveal the secret. That caulking around the perimeter doesn't look 'factory' to me. Maybe the taillights are supposed to snap in place and a DPO (Damn Previous Owner) glued them in with caulking?
You could try logging on to Thor's Customer Support section. Jot down your RV's VIN - the page uses that to help get you the correct info. https://www.thormotorcoach.com/ -> Owners
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Eric
North Carolina
2015 ACE 30.1, 2017 RAV4, 1999 F250, 1991 Honda ST1100, 1984 Alfa Romeo Spider, 1981 Alfa Romeo GTV6, 1961 MGA
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