Hertz rentals is the best. They have cars almost everywhere. The cars are nice and tidy, well served and more or less always brandnew. I have driven Hertz cars all over the world. hertz.com
Bags, bases, harnesses and all other small stuff is more important when you are serious about windsurfing. With Unifber I am in good hands, and what I liked the most, they listen to me and refine the equipment! https://www.unifiber.net/
Ackert is the leading decal and film producer in west Sweden. They have worked hard to make the best decals for the new materials such as sailnumbers on Pentex and X166-film (different kinds of X-ply). ackert.se
When it comes to fins, I test and use fins from all different fin-builders. In general I am not very found of factory-made fins but sometimes they are very good. Here are some makes that I like a lot:, Hurricane, F-Hot, Gasoil and Z.