I was not very happy with my first attempt to route the wires from the solar panels to the inside of the van but I found a very good and also very cheap alternative by using a plastic watertight junction box from the local Home Improvement Store. The only difficulty in this job is drilling holes in your roof to mount the box but in total this is not even a 2 on the difficulty scale.
This post is about installing a roof fan to bring in some fresh air into your Sprinter Van. Warning: This requires cutting a hole in the roof. If you already installed windows this job is fairly easy (probably a four on a 1 to 10 scale).
If you want to carry stuff on the roof of your Sprinter Van you need a way to secure it. An easy way to do this is to install some roof rack tracks. That gives you a base for all kind of options: from a simple roof rack, a base for your solar panels up to specialized roof racks to hold your Kayaks. Once you’re over the fear of drilling holes into the sheet metal of your Van, this job is super easy. I would rate it a 2 on the 1 to 10 scale.