People who are in the BeamNG Content Creator program get access to the updates earlier so they can make vids on it just in time for release…
My thoughts are that FPU was originally just a trailer company, but in the mid 2000s a small team of their engineers started working on their own personal side project (the Wydra), and they presented this prototype to the FPU execs. The execs liked the prototype and decided to start mass-production of the Wydra in 2008. As for the lack of content with the Percheron, it might roll out in waves, like the T-Series remaster. Remember how that first drop included all of the remastered trailers? Maybe they'll add more content to the Percheron in future updates.
Tbh, I didn't really find the Percheron to be lacking in content for its first release. It has every basic and usual configuration met every day on the European roads; the single- and twin-rear axle fifth wheel trucks, the box truck, the stationary flatbed truck, the cement mixer truck and the tanker truck. Plus the twin-steer variant. It's certainly gonna receive extra content and configurations in the upcoming updates. But I hope the FPU Box Trailer and Tanker Trailer also have the Muhten Tag paint design and I also hope the FPU Tanker Trailer also comes in a long form, because that's also a usual sight on our roads!