Well, . . . I'm not trying to be mean either, but the photographs very clearly show an M105 trailer. The NSN# (National Stock Number) designates exactly what a piece of equipment is. In this case 2330-00-141-8050 is an M105 trailer, and ONLY an M105. The description given on the listing page is erroneous in both size and weight. An M105 is significantly larger than that and weighs almost 3000 pounds empty.
The other glaring clue is that it's described as a 1/2 ton. I am not aware of any such animal in the military inventory. They have 1/4 ton, 3/4 ton, 1 ton, and 1-1/2 ton. More recently they've even stuck in a 5/4 ton trailer, but I'm not aware of there ever being a 1/2 ton.
If you're looking for an M101, even that's a big trailer. It's a 3/4 ton and probably weighs about 1200 pounds empty. If you're thinking of the small 1/4 ton trailers, you must mean the Canadian M101 which is pretty much a clone of the US M416.
If you were confused before, . . . . . . .