Being a longtime RV'er, and following our stuff compared to the European made products, their's are years ahead of our RV's.
Almost all their products use lightweight materials, and composites as their vehicles that tow or carry are smaller than ours in general, and their fuel costs are so much higher than ours. They try to keep stuff light.
I would take a guess that the slide in pictured weighs 500-750 lbs less than the equivalent made here. Our stuff is heavy, lots of wood, clunky interior stuff.
I don't think the Ranger pictured, or our US version would have any problem hauling it.