In reply to Frank the Husky:
There's a massive sports shop just outside Hamburgsund and a smaller version of the same shop in Lysekil. There's a Biltema just next to the motorway in Uddevalla and you may well be able to get screw in gas in many of the bigger petrol stations. I guess you fly in Gothenburg too? In which case you'll have loads of possibilities.
I don't think you'll have problems.