This picture came from the New Horizons website. I know a bit about their trailers, as I own one and just happened to have pulled ours most of the day today.
The picture shows a Majestic that is probably > 39' long. They are heavy, I'll bet the empty weight of this one is > 21,500 lbs empty with an empty pin weight of > 4,500 lbs. Loaded, who knows, but they don't get lighter as you load more stuff into them. I find it highly likely that the truck shown hitched to the trailer is overloaded when all the stuff is loaded into the truck and trailer for a trip. Most people pull a heavy majestic with a 5500, Freightliner M2, or even a class 8 truck.