There are only about twelve crossings along the entire German-Swiss border. Apart from short stretches around Basel and Schaffhausen, the entire frontier runs along the Rhine and Lake Constance. Over the past twenty years, I've seen queues of trucks and vans backed up at the Lorrach/Basel, Rheinfelden/Basel, Koblenz, Schaffhausen and Kreuzlingen/Konstanz crossings (queues seemed to be longer for traffic entering Switzerland than entering Germany) and I can't recall ever not seeing a backup of commercial vehicles. Cars cross unhindered on ordinary roads but the Swiss stop anyone moving onto a motorway to squeeze their autobahn tax out of them. They usually look over the car while they're at it and I've seen a few being pulled over to one side for offending one of the many things the Swiss get offended about.WTO is not about having a Berlin Wall and doesnt care about car theft etc, it is about having "Trade" controls (which link back to quotas), how do you think the rest of the world manages? You think there is a que of trucks at the swiss border? There isn't even a gaurd at some of the Swiss / German crossings. You are talking about a border to combat crime etc, that's not WTO remit, that is political.
It's much the same along their borders with France and Italy which also don't have that many crossings (Jura Mountains, Lake Geneva, Alps, Lake Maggiore) and there's usually a serious line of trucks waiting to cross at Saint Louis/Basel, Geneva and Lugano.