You have to go with the rules that apply where you're going, so no argument about the inspections. I would expect that if there is enforcement of small towed loads the makers there would be more likely to specify a "loaded weight" (MGVW). That's something that US manufacturers almost never do, at least in the advertisements.

Here, a "trailer" is anything you drag behind a vehicle.

The foldable ones like in my link up above are called "tent trailers" or "Popup campers," although the terminology gets bent quite a bit depending on who's talking.

Another version, sometimes called a "Hi-Low" has hard half-walls that overlap when the top is lowered and make a more or less solid wall when cranked up. These often combine the worst of everything by having canvas walls on "slide-outs" that move the bunks out of the "living room" when you set them up.

The Scamp and Casita are similar, and usually just refered to by the brand names. Sort of "bubble shaped" small units. They can have "luxurious" accomodations inside, but due to the small size you may have to toss one luxury out the front door to take advantage of a different one. Designed, perhaps, to evoke the "Airstream" concept that was popular in the 40s and 50s, but the Airstream is a full sized "Camper."

A very few of the "A-Frame" foldables, mentioned above, have been seen here, but so far as I've seen none of them seem to have come back the next year. I haven't talked to any of the users to see what they have to say about them.

I suspect (with little evidence) that the variety of common rigs available in the US (most of which you can get in Canada as well) is probably a lot broader than what's seen in the UK; but it should be possible to find pretty nice ones almost anywhere. the main decision needed is whether the one you can find does what you want it to do, when YOU use it.

It's also not surprising that enforcement is somewhat stricter elsewhere than around here. I see lots of rigs on the road here that scare me when I think about load factors and suspension stability. (And I've seen pieces of a couple of them in the ditches beside the road.)

John