The camping trailer is one of most popular towable RVs that exists.
This is because it is small, lightweight for most cars to pull, inexpensive (comparatively) and is, to a degree, a towable-nearly-setup-tent.
There is substantial gray area between travel trailers and camping trailers in my mind. But for me, a camping trailer, done well, could be pulled by a CAR.
If you need something bigger than that, then you might want to ask yourself – why am I buying something too big for a car – and then simply jump to the larger travel trailers. To me, the camping trailer is a “tent on wheels” and I think if you keep it in that mental box you'll do well.
Again, the camping trailer substantial cross-over with travel trailers. Don't let it get you down.
These campers could be considered tiny travel travel trailers, but they typically lack some of the RV amenities and are essentially “hard sided tents on wheels”.
They are great for get-away from it all weekends. One of the big differentiating factors is that these RV's can usually be pulled by a smaller vehicle, like a Honda Accord.