Can we leave the caravan somewhere in the area of Östersund?

Hello,

I have a question.
For 9 years we've been going with colleagues from Polish to Sweden on fishing trips.

plus.google.com/photos/102974985919352957003/albums

This year we bought a caravan (7m long).
In the middle of May we are going to come to Sweden to the Lake Storsjön and here we have a request.

Can we leave the caravan somewhere in the area of Östersund?
If we don't, do you know anybody that we could leave the caravan?

We would like to go to Sweden 2 maybe 3 times a year (for 10 days) take the caravan and go fishing.

We ask for your help.

Regards and waiting for a response in an e-mail.

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Krzysztof Chmiel