Yep, noticing that. So far along those styles I've found:
Turtleback
Borderland
Xventure is almost there, but not quite the same as they don't have the side boxes.
Turtleback and Borderland trailers are great trailers, nicely-designed, and are both made specifically for camping.
XVenture is meant to be a completely different beast than either of them, or the Patriot, or most any other trailer designed only for camping.
It's a military cargo trailer in both heritage and style, made by the same manufacturer that has made over 50,000 military trailers for governments around the world and that have been tested at the Aberdeen Proving Grounds in Maryland.
The XV-2 has a cargo bay of almost 8' long with 49.5" between the wheel wheels. That's like the size of a full-sized pick-up bed, though on steroids in build. So far, in all the wandering around America I've done, I haven't needed side boxes on my XVenture for anything.
The trailer is air-lift rated, too, meaning it can literally be air-lifted and dropped by parachute onto the battlefield or into a rescue situation or natural disaster recovery. They can be used for hauling large items like a motorcycle or ATV, or used for urban and rural jobs like moving over a ton of gravel, railroad ties, a stack of sheetrock or plywood, or your kid's belongings to college.
It can also be used as primary support for rescue and disaster situations or for off-grid living, providing power, water heating, and storage all while still being able to be used as primary transport for over a ton of materials.
That's exactly what I love about my XVenture; it's supreme versatility, extreme ruggedness that will outlast any other trailer I've looked at, and that I can configure it any number of different ways for diverse applications at the drop of a hat. I can't afford a trailer, really, that might sit unused a good part of the year if I'm going to be helping someone build an off-grid home, or helping family with landscaping, or moving, or need it to be pickup for chore days.
Heavy duty aluminum trailer frame, all HuckBolt construction, trailer tub all double-walled, all linex-ed. All plumbing and wiring is mil-spec.
Hard-rolling titanium locking cover, which has proven to be just amazing.
All of this gear, with the exception of the bike and the black rectangular storage bag with the X straps on it, fits into the cargo area of the XV-2.
Both RTT and expansive awning deploy within minutes and pack up just about as easy. I can't say enough how much I love this set up and how it all fits together, while still being an awesome bit of gear I can use for any number of other endeavors.
The XV-2 Power Center. Two Odyssey deep cycles, solar charge controller, Noco Genius for battery charging, shore power capability (never used it yet, as my solar has provided all I need so far), fuse box and switches for water pump and LED lights, and I now have a 1000W Pure Sine inverter and an ARB air compressor in this section, too.