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https://www.amazon.ca/Keyless-Handle-Trailer-Caravan-Controller/dp/B07TVY41B2/ref=sr_1_135?crid=1P4UNWKVRZV7O&keywords=rv+combination+door+lock&qid=1583191591&sprefix=rv+combination+lo%2Caps%2C194&sr=8-135

Setting the Combination

https://www.google.com/search?q=how+to+set+combinmation+on+rv+Keyless+Entry+Door+Lock+Latch&oq=how+to+set+combinmation+on+rv+Keyless+Entry+Door+Lock+Latch&aqs=chrome..69i57.5300j0j7&sourceid=chrome&ie=UTF-8#kpvalbx=_lp9GYcOJPNCyggeYrouIDw50

• Press RESET button on the inside
• Combination resets to 1-2-3-4
• Press 8 and LOCK
• Press current combination and LOCK
• Press new combination and LOCK
• Press new combination and LOCK

Original Door Lock

Installation

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The plate that goes around the latch does not sit nicely and prevents proper closure. Currently this has been removed.

Enhancements

Reduced Buzzer Volume

The buzzer sound out of the box is pretty loud. To fix, I cit the copper trace and jumpered the connection with a 10K resister to reduce the volume.

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Fiberglass Work

In order to have a nicer looking lock installation, I removed the door and fiberglassed the hole on the front of the door and added fiberglass to the inside to make the lock sit flush.

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Moved Hinges

In order to get the hinges not to hit the belly band, I moved the hinges to 1/3 the height of the door. 

The door measured 64 1/2" which put the hinges at 21 1/2" and 43".

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References