We have a 2017 21' (2nd gen), and the RVLock 4.0V was an easy swap with no alterations. If you have time to wait, RVLock usually has a 40% off sale around Thanksgiving (folks on this forum always post a heads-up), and if you sign up for RVLock's notices, they throw in a 20% off sale at random times throughout the year. I believe, from a prior thread, that you can also get locks for your hatch(es) key-matched to your door. So you know, the key-less locking mechanism only works the deadbolt. So if someone else key locks the latch handle on their way out, then you'll still need a key to unlock the latch handle to get in (don't ask me how I know that).
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