Jayco Camper Lock Door Tongue
thingiverse
Needed a decent resolution to get a smooth 45 degree angle on the edge parts, although didn't seem critical when I used it with my rough draft print. Might also consider a stronger material than PLA+, but with a full infill, it seems quite strong. I added a version that had a cutout on the bottom edge to suit my door latch sitting low in the receiver... And another with a few holes for less material in the main part. Just made it up in Tinkercad. Lots of simple shapes, but can likely tweak to suit any nuances you have. https://www.tinkercad.com/things/7DR5FDWWs1M The 45 degree edges could be reinforced too, or at least made thicker, but the latch appears to distribute its weight across it fairly evenly.
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