I got a good look at things today and did some measurements since I had the wheels and hubs off for brakes, bearings and seals check. Double lip seal on one side is toast. Outer lip is gone and inner spring is busted.

I think I found my issue. The axle and spring pack are one sub-assembly that clamps onto the frame. I'm measuring 1/4" off on both spindles to ball mount and subframe to rear frame. It looks like a simple matter to loosen the u-bolts and adjust one side to equal the other.

Bearings look good although the grease on the side with the bad seal was overdue for a repack. That side castle nut is an RCH off being able to get well into another notch, so it runs a little looser than I'd like, but is acceptable. Grease on brake parts though the pads and drums are OK. Slave cylinder outer dust boots are cracked and brittle. Ordered all new assembled complete brake/backing kit from e-trailer cheap. Just have to swap them out and bleed.

Thanks again to all who advised. Turns out this is a simple DIY fix.