I will agree, it is an A3. It is a very clean and nice looking trailer, congratulations. If you are towing it back home make sure you stop after about 10 miles and 30 miles there after to check the hubs for heat. If they are really hot you will need to take care of that. Likely they will be fine as the trailer looks like new. I would also suggest if you have it bring a spare. I always do this when I pick up trailers from Hooks as it is a 200 mile trip more me.
Never trust what is said in a GL listing, inspect or study the pictures. I have seen many times A2 trailers listed, but it was really an A3. Or even in some cases an A1 listed, but was a A2.
I have even seen a M1009 maintenance truck that was really and clearly a M1031, but the door was replaced with a M1009 and GL did not catch it and listed it wrong.
I do not know what it is about them, but I love these military trailers. I am really thinking about getting a nice 3 color wilderness M101A2 to pull bind my M1031 for shows and parades. Price is high compared to going to GL directly, but rarely do I see good non-tan trailers locally. I wish I lived in the country with allot of land as I would probably start collecting military trailers. I just think it looks so cool seeing one being pulled behind a military truck.