Welcome, Dee!
The
Burro is one of many 13' molded
fiberglass trailers. In egg parlance that means they have a 10'x6.5' shell on a 13' long frame, tongue-to-bumper.
The "Manufacturers" tab at the top lists many of the current and legacy makes. Not all make a 13' model.
Scamp is the most common, along with
Casita and
Happier Camper.
Armadillo and Relic also make semi-custom 13' trailers. Many others, including the
Burro, are no longer made.
Most of the 13'ers have a similar layout: dinette/double bed at the back, small galley in the middle, and bunks or a small dinette at the front. A few, mostly newer, substitute a wet bath in front.
Weights range from about 1300 pounds to around 2200 pounds, with 1600-1800 pounds pretty typical for a loaded-for-camping 13'er. The thread
Trailer Weights in the Real World has some good data on actual weights of different makes (the 800 pound Burro listed is probably a gutted shell). Post #297 links to a spreadsheet of the data.
Before you get too far, make sure you have a vehicle to pull it with. Some sellers claim "under 1000 pounds" and "you can pull it with anything." 'Fraid it ain't so! A tow rating of 1500 pounds is marginal; 2000-2500 pounds is better. Check the towing section of your owner's manual for the scoop on what your vehicle can handle.
Personally, I wouldn't limit my search to just a Burro. Prices for used 13' trailers are similar among the various makes and have more to do with condition (as well as location and season) than with manufacturer. By considering other options, you have a better chance of finding something in good condition within your search radius and budget.
Best wishes on your "egg hunt"!