Noticed today that the trailer was leaning some to the right toward the right side of the road. There is also about an inch more clearance between the bottom of the nose section and the truck bed rail...
When one pin or side links lets go on a trailer as old as yours its time to replace all pins and bushings. You also will need to check all the holes in the equalizer and side links for oblong worn holes.
A big rig trailer repair shop can handle that type work and realign the axles to specs if tires show odd wear patterns after the pin/bushing RR.