Utility Cycling subforum does have a trailer construction sticky, if that's what you're after.

As for which ready-to-roll trailer is best for touring, this thread's as good as any if some replies come along.

I have a homemade 2-wheel lowboy trailer but it's too wide and too heavy for touring use, IMO. The lowboy nature makes it unflippable, however, which is quite rare in the 2-wheel trailer realm.

I'd probably go with a BOB if I wanted a touring trailer.

EDIT: dug up some pics of the lowboy cuz every thread needs pics.

Empty:


Loaded:


Tows great but the unloaded weight is ridiculous. Gotta be about 60 lbs.