Tire attributes other than longevity

My question is: Are there other tire attributes such as comfort, braking performance, wet weather performance, tracking, handling, or even side slipping during backing that I should consider? My tires are 235/80R16 LRE and I run them at full sidewall 80 PSI even though I only average a little over 2,000 pounds per tire. I'm thinking about using the tire inflation tables on my next tires, are there brands more amenable to being aired down?

Keeping those blowmax pumped to 80 psi was a big help with them lasting that long. Most RV folks don't say how many miles their tires on their trailers have but with only 9 or 10/32" of tread about the most their good for is 20k-25k miles on heavy rv trailers.
Using those minimum tire pressure charts for close spaced tires on a trailer with the axle in the center isn't the best idea.

Have any of you changed brands and could immediately notice a difference in the quality of their tow?

For a 2000 lb load per tire you sure don't need a 16" tire with 3400-4000 lb load capacity. Is that a actual scaled weight or a estimate ??
Another very commercial grade good all steel ply carcass LT E tire that is recommended for trailer use is the Bridgestone R-250 and the new R-238. The R-238 has more sipes for better traction on wet roads.
The Provider ST have been around since the '11 era and are probably one of the first ST brands that came with the new M (81 mph) speed rating. Their a proven ST class tire more so in the commercial side. However some say their OEM on certain brand RV trailers now. check them out if you want to stick with a ST tire.

All ST tire were problematic even when they all were made in the USA by our domestic tire makers. And yes most of the older ST C/D/E china made tires had a very poor service record on all types of trailers (rv and non rv).
However....Goodyear and Carlisle are our oldest ST tire makers and both have came out in the last year or two with some very good looking higher speed rated ST tires. Time and miles of service will tell their stories on reliability issues.

My old '97 rv trailer has 5200 lb axles with a 11200 lb gross weight and 2400-2480 lb load per tire. I like a narrow tread for tires on a trailer so I went with a LT215/85-16 E at 2680 lbs per tire. That way I can keep them pumped to 80 psi for max. The first two sets ran for 7 years each at 55k and 52k miles. I'm into the 3rd set with around 15k miles. No issues with any of them.