On paper switzerland is a neutral nation so their trucks and 'ships' would be let through no problem but I find that being true hard to believe based on well... everything.
So, today I learned the british government commissioned swiss watchcompanies to make a whole bunch of wristwatches for its troops. How did the swiss send their product over to the british isles? Did the germans just shrug and let them through? Did the swiss threaten them with boiling hot chocolate? Did the british send in paratroopers on a life or death mission to retrieve the watches? Or did they seriously smuggle thousands of wristwatches over to britain? Maybe they lied and told the border guards it was for the civilian market.
Thanks for reading.
This older answer of mine should be of interest.