Pete,
That picture shows a pretty bad coupler attitude - looks severely bent or broken!
Ultimately, I installed body mount Kadee centerset type couplers on the Aristo Heavyweight cars (with much closer coupling distances) which operate down to 8 foot diameter track.

All cars have 3 axle trucks that were remounted with varying methods of washer placement at pivoting areas that provide a minimal space between the truck and body for less friction there between.
The following “vignettes” hosted for me by Greg E. on his Web site may be of interest (The first two show truck mount couplers before I went to body mount Kadees):
Aristo-Craft Heavyweight Passenger car 3 axle truck types, at below link:
https://elmassian.com/index.php/large-scale-train-main-page/ted-vignettes/ted-vignettes-p3/aristo-hw-pass-3-axle-trucks
Napa Valley Wine Train Heavyweight cars changed from 2 axle to 3 axle trucks
Aristo Heavyweight Passenger Car & Body Mount Kadee 907s
-Ted