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Needed to mount my Garmin Varia on the back of a bike trailer for kids, specifically an Allen Sports T2 (basically this: https://www.amazon.com/Allen-Sports-2-Child-Bicycle-Trailer/dp/B0DCNTW3YV/ ). I designed it to mount on the back corner. It may work for other bike trailers with or without some modification.
This is another remix of mine of the Garmin Varia rail mount available here:
https://www.thingiverse.com/thing:5907329
Or my longer, strengthened version here:
https://www.thingiverse.com/thing:6826344
You should be able to use either version of the actual swivel/Garmin interface included with the original design above.
I used 3mm screws (x3) to put it all together, along with 3mm\*8\*5 (2x) threaded inserts pushed in with a soldering iron (from this set: https://www.amazon.com/dp/B0CLKDPN65?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_12&th=1 ). Furthermore, I used some washers (x4) to prevent the screws from getting drawn into the plastic.
I printed in PETG, though anything that is both heat- and UV-resistant should work.
The picture shows how I initially mounted the Varia upside down, as I thought there wasn't enough room to mount right-side up; but it turned out there was, so I mounted it right-side up.
If you like the the 3M Command Strip loop that I use as extra security as shown in the picture, that's available here:
https://www.thingiverse.com/thing:6826317
