I've looked at these for several years and we went and looked at some new and used at a dealer here in Central Texas called
PrincessCraft.
Pros:
relatively light weight
wonderfully spacious feeling inside
the walls easily pop up in perhaps 3 or 4 minutes
solid walls, so quiet inside if you camp in noisy campgrounds
there are off-road options
most owners adore them
The small ones would definitely qualify as a Tiny Trailer!
Cons:
pricey, very, very pricey (even used is not cheap, and older models can have issues with leaks and soft spots in the floors)
Chalet brand is thought to have somewhat better quality than A Liner
the tiny kitchen area is very low--much lower than standard counter height. Although there are hi-wall options, I recall that these are not quite counter height either
zip for storage
can be hard to set up in high wind condition
There is an RV dealer in Oregon with the best prices by far. I'll try to find the link to their Web site when I get home.
PrincessCraft also carries T@B Trailers, but the maximum height inside is only 5'9", so not quite high enough for us. However, T@B now has a floorplan with a tiny bathroom and another floor plan has a galley in back (Clamshell option).
http://tab-rv.com/floorplans/If the maximum interior height was just a few inches taller, we would seriously consider this as an option.