I just returned from a car trip to North Carolina myself and noticed an extreme number of all types of vehicles with flat tires all along the road. I noticed 7 different vehicles with donut spares installed, with two of those on the shoulder with the donut shredded. I probably saw in excess of 20 vehicles with flat tires, cars, pickups and RVs, but not a single semi.
No clue if that relates to the RV issue OP saw, but there is probably some overlap in that I believe a lot of people in the world operate under the idea that things like cars, mowers and even RVs are self-maintaining. Those of us who have been around a while remember needing spark plugs every year, changing oil every month or so and a lot of other more maintenance intensive ownership experiences. Things are much more hands-off today so people are less likely to check things like tire pressure or condition.
I think the real issue with the cheap tires is that they have no margin for error. Run them a little low or heavy and they will give it up quickly.
I've destroyed trailer tires over the years every way possible from neglect to physically yanking the tire off the rim on a culvert. The first money I spent on my 5th wheel after I got it home was a TPMS and every time my feet touch the ground on a trip I'm visually inspecting the hitch, tires, truck and trailer.
Stuff is still going to happen, but I'd bet the majority of rigs you saw on your trip had problems that could have been dealt with more easily with a little more care before getting on the road.
Much easier to fix a leaking or separating tire at a gas station than to replace a blown tire along the road.