You should really go to the scale house to get your actual curb weight empty bed, one driver, dogs, significant other, full tank of gas, any emergency road gear you always carry and find out what that number is. THEN subtract that number from GVWR to get a real world payload number, not the...
GM's own trailering guide says for EVs not to charge past 80% charge on your batteries if you are driving up long steep grades. I guess driving flat lands or small hills - this doesn't apply.
Towing with a Silverado EV, Blazer EV or Equinox EV Do not charge your vehicle’s battery above an 80%...