When you look for a trailer, do not get a 2 horse straightload with the 2 doors in the back. It will be too narrow for a full grown bull or cow to turn around in to get out, plus if it has two doors on the back, it will be even harder to get one out. Another thing about a straight load trailer, if it has a feed manger, the actual floor space for the animal will be less.
If you can find a slant load trailer with the one door in the back will work better. You can remove the divider. I have a two horse slant load combo. The divider comes out if you need to haul cows.
Try looking for a stock type horse trailer that has one gate in the back and removable dividers. Also have your bumper checked to be sure that is will be secure and strong enough to pull the load. I would also check with your employer about using it to pull a trailer. It could affect the insurance should something go wrong. Good luck.