We (I?) understand that you want the weight bolted to the ROPS and bearing down on the drawbar.
Here's a similar arrangement using weights salvaged off of exercise equipment and resting on the drawbar, that I used for a while to improve traction pulling my 2600 lb watering trailer uphill.
But we're trying to steer you to weight you can simply drop and abandon, similar to an implement, rather than semi-permanently mounted.
Maverick your first photo with the chrome trailer ball, has a loop to solve the problem of the ball rolling over upside down just as you back up to a trailer. Here's my similar solution. Cat1/2 sleeves with a flat bar welded to them, then the sleeve/bar assemblies bolted to ends of the crossbar. I've used this for several years. I thought the flat pieces might bend, but they haven't. This works well.
In the last photo he will likely need to park the bucket of cement on something. Because the 3-point arms may not go low enough to connect, if he leaves the cement bucket on the ground. I see he has a jackstand under there to hold it up when he parks. A better design is a steel bar punched side to side through the bucket a foot off the ground, at a height where the 3-point arms can match up, before pouring the concrete. Stepping up in elegance, add a trailer hitch and some holes in the concrete to carry a shovel etc upright, before the pour.
