Your clickable link no work...  You do know that Cato has been out of business for a few years now..? 

http://www.horsetrailerworld.com/Home/trailerdetail.asp?ID=523962

 Check that floor real good, may have some corrosion holes already in it. Also only has one rear door on the right side. Figure on replacing the tires and brakes, have the axles checked for straightness... Alot of these 6 horse trailers with larger tack and side ramp were used by haulers, run loaded to the max most of the time and have a gazillion miles on them... Check it out good before you buy. I myself prefer a head to head over a slant...

There were multiple companies that made trailers using the Cato name. Similar ownership, but used different corporations for financial/legal reasons and in different manufacturing locations. Some were better trailers than others....

Check the floor, neck, and rear posts well. Look for any buckled skin, as it indicates flexing has occured.