The rear axle photo shows that it's borderline.
When the torsion arm is parallel to the chassis, "when the trailer is fully loaded" the axle is on it's last leg.
Your torsion arm, shows a slight downward angle, but I assume that the trailer is empty.
As weight is added to the trailer, that torsion arm will move upwards, since they are weight sensitive.
Anytime the torsion arm is parallel to the chassis, when the trailer is empty, is almost a guarantee that when the trailer is loaded, the torsion arm will angle upwards from parallel.
The other test is to jack up the trailer on one side. The tires should drop about 3 inches. If they do, then the rubber rods are OK. If they do not drop that much, then the rubber rods have solidified,