Just a couple of bewares for both:
The swivel trailers can really add to the tail swing! I watched a Cougar with an ATV on a swivel trailer struggle to get out of a fuel station onto the road.
A standard trailer on too short of a tongue can make for a bad vacation as well. The wide swing on these 5th wheels can put that rear trailer at a tight swing pretty fast and it may meet the rear clip on the 5er. Check the turning angles and consider its not always level.