I’m not sure if this is the correct part but bikeshop.no have all the parts for that trailer.
http://www.bikeshop.no/topeak/trkttrsp01/topeak-stikkaksel-til-journey-tilhenger-sort?gclid=CjwKCAjwwb6lBhBJEiwAbuVUSogAMfSCHPSGsiXY4YY5v0O7OQaf8PP4n6VbWT0fAShz8-7In1itxxoC2XAQAvD_BwE

They have an express next day delivery option (Posten Ekspress neste dag 399,00)

Order before Thursday afternoon and you’ll have it Friday. Just find a hotel to use as a base/address for a few days.

While waiting do a few day rides in the area.

Good luck.