No doubt that LT tires are better overall than ST tires, primarily due to them being produced here than China. I know we have been pretty lucky according to what is said online, over 3 decades of RVing and we never had a blowout, not even a flat from using ST tires. We always replaced them after 4 years of use, biggest issue with ST tires is overloading and under-inflation, unfortunately RV manufacturers send their units out with barely enough tire to begin with.
Most of us would agree that towable RV manufacturers would be smart to have LT tires standard on rigs weighing over 10K#, just won't happen as penny pinching reigns supreme in their manufacturing concepts. Thankfully there are better choices for ST tires now, they will always be around since many towable RVs come with 14" and 15" stock tires, where locating a decent LT tire in those sizes can be troublesome.