@TrailWhale this thread is awesome. I finally made my decision after lots of mental back-and-forth between the Victory 3/4, Sherpa and (not on your list) Bison Gear OX PRO. I chose the Bison Gear OX PRO based on my very positive experience with their rear cargo system and excellent customer service. Out of Poland, so shipping lead times are the only real drawback. In case you want to add it to your list:
https://bison-gear.com/collections/toyota/products/ox-pro-roof-rack-lc250-gx550-1
Price: $1,700
Style: Full
Dynamic load: 120 kg (264.555 lbs)
Static load: 400 kg (881.849 lbs)
Dimensions & other notes: 46.46"W x 94.49"L x 7-8cm (3")H; 35 kg (77.1618 lbs); Aluminum frame/Aluminum crossbars/steel hardware; 8 crossbars w/ 11.65" center spacing; removable upper fairing panel for installation of light bar.