Samson 16" GL 285T load G is a go to tire on haulers websites. One thing we do not use or recommend to others is derate those heavy tires with 80-95 psi low pressures like we see on rv websites.
Top rated 16" load G for trailers with 7k-8k axles on rv and non rv trailering website without doubt is the Sailun S637 which comes in two 16" sizes at 4080 lbs or 4400 lbs capacity.
I have six S637 on a triaxle GN stock trailer/7k axles with around 35k-37k miles with no issues. I keep 110 psi sitting for weeks or full loads or half loads on local runs 400-450 mile runs.