I realize it's not your concern BUT ""it would be very interesting to know"" what one of the bales in your photo actually weight more especially the bale on the rear of your trailer. I've baled,purchased & sold 1000's of rd bales since I started custom baling in 1987. Bought a lot of 4X5.5 bales that were advertised @ 1200#s that didn't make it weighing much over a 1000#s on a scale. That's when buying by the ton becomes very important! Weighing bales eliminates a lot of the "guess work"
I went back over yesterday afternoon/evening to pick up my tractor and trailer and bought a tape measure with me but it's hard to get an accurate measurement on the diameter.
The thing I learned from this experience is that the MX can handle unloading this size of bale stacked on a trailer as shown. It really doesn't matter to me but the friend I was helping is expecting to buy the MX when my new one shows up. He's even stopped by the local Kubota dealership and asked them when MY new tractor will be here which is a bit much.
I will say that the inability to use the roll back feature with the loader at near max height was disappointing but that's just the limitation of having a 1,000 + load that's way out in front of the pins. Regardless, my friend was very pleased with the performance of the MX since it did what he needed with no fuss. Unfortunately, he doesn't look after things so the MX will most likely die a slow, miserable death at his place.