Your question depends on what you consider a weekender. Some people use the term to describe a short, fully equipped LQ. Others consider any space that has a minimal amount of equipment to be a weekender. I've seen trailers called weekenders when they only had a mattress thrown into the bunk.

We have an Exiss that has a professionally installed LQ with only a 4' short wall. This includes a seperate bathroom with shower. The trailer is a 3H GN with an 18' box, a 7 1/2' goose area and it weighs ~5500#. It works very well for two people for a long weekend. Any longer lengths of time and you'll want a larger living area. It's light and short enough to be highly maneuverable and very easy to tow.

We replaced a steel 18' 3HBP trailer with this aluminum GN. There is no comparison in the comfort, utility, and lack of constant maintenance between the two. It's an ideal running around, trail and show trailer.

I have a 2 horse Sundowner gooseneck with 6 1/2 ft weekender (cupboards, bed, bench, water, etc).  It weighs 4,200 pounds empty, probably won't go over 7,000 lbs with 2 horses, hay & tack.  I am downsizing from a 1 ton truck (used to have 4 horse steel trailer) and have asked for truck opinions on this list.  Here is the link to that thread; it may be helpful in this conversation:

http://www.horsetrailerworld.com/forum/thread-view.asp?threadid=14875&posts=24

Based on the information gleaned so far, it appears there are only 2 half-tons that I could consider - one being the Ram hemi IF it is a Mega Cab and the other a 6.0 Chevy 1500 HD.  Also consult with the tow rating guide for your particular truck.  Several years worth of tow rating guides can be found here:

http://nebraskahorsecouncil.org/welfare/tow-rating-guides/

All things considered, I will probably go to a 2500 so I not only have enough truck to pull, but to stop the rig, as well.

Good Luck!