While one should always be concerned about their tire care. When choosing a new tire remember; the RV industry sells over a million tires a year and has for several years. Of those millions how many have failed?
There is no doubt the RV industry uses the least expensive tire that will do the job, but what is the failure rate per million of the tire you are buying?
Also, no tire is safe from road hazards or poor maintenance and an upgraded tire may have a higher load rating but you are still putting it on the same axle, which has a lower load rating than your original tires.
In general the more expensive tire compounds do offer more mileage and perhaps more scuff resistance but they usually time out long before they wear out.