In North America we have bright orange florescent "slow moving vehicle" signs on the back of farm equipment and the like. If you are impeding the flow of traffic and you don't have a slow moving sign, you're committing an offense. Most of our rural highways have no passing lanes; the yellow line in the center indicates when it's safe to pass using the oncoming lane.
Also,, as someone else mentioned, the government dictates towing vehicle limits here, not the manufacturer. We all know how honest vw is when it comes to reporting their vehicle specifications.
I still can't envision a VW golf pulling a 4400lb trailer. I'd be surprised if the tongue weight alone doesn't lift the front wheels off the ground. My GMC Sierra with a 4.8l v8 struggles to pull my 6000lb travel trailer. According to GM, it's slightly overweight but according to traffic safety laws I can pull it, considering it's vehicle class.
This isn't Germany, people don't drive like robots, so you have to drive defensively at a relatively equal speed to the rest of traffic or some idiot will end you.