What are some of the high volume / most active trade guilds on US server?
I keep joining some that claim they are but never any mats, not can I seem to sell any of mine. Very little gear. Very little of anything to be honest.
Check the traders in Mournhold, Orsinium and Rawl'kha. Those are super high traffic areas and rarely do any of those guilds lose their spot.
Look for the guild traders in the main faction cities, plus Craglorn and the main DLC cities. Those traders are usually hired by the most active large trading guilds.