Bit of a history lesson here - many years ago wheel rims were flat apart from the well in the middle which is necessary to allow to tyre to be fitted. Accident investigators soon found that some tyres had deflated, allowing the bead into the well, in turn allowing the tyre to come off the rim with inevitable loss of control.
The safety ledge wheel rim has raised ledges between the bead seating area both sides and the central well - this reduces the risk of tyre coming off the wheel rim but isn't absolute as the safety ledge size still has to allow the tyre to be fitted.
The motor industry universally adopted safety ledge wheels many years ago as a good safety feature. The caravan industry didn't adopt safety ledge wheels, a perverse decision, but were eventually forced to by the lack of availability of non-safety ledge wheels.
With it's own internal safety campaigns as well as external pressure to improve safety, the European motor industry has a good record for introducing obligatory safety features. The caravan industry has a poor record, rejecting obligatory safety measures for gas, electric and chassis systems.
It's very significant that Tyron safety bands haven't been made obligatory for motor vehicles and aren't generally promoted on a voluntaty basis.
The use of other Tyron products to allow continued emergency running for police and other priority vehicles shouldn't be taken as an endorsement of Tyron safety bands for caravans.
The sidewall is by far the weakest part of any tyre, but the nature of it's function of continuously flexing. The fact that Tyron safety bands are no use at all when the sidewall fails, the likely result of any tyre failure, means that it's value must be very limited on a wheel with safety ledges as modern caravan now have.
What do I do? I replace the tyres every five years using a reputable brand and a load rating at least 10% higher than the caravan's MTPLM, ensuring that the tyres/wheels are balanced. Before EVERY tow, I inspect the tyres for visible damage and adjust the cold tyre pressure to the specified level. During our winter lay-up the tyres are removed from the caravan, stored in the dark and re-painted every spring to replenish the carbon in the sidewalls lost by exposure to UV light.
I'm a great believer in commercial pressure - if the companies that insure caravans had any evidence that Tyron safety bands are beneficial, they would either be a requirement or have a loading on the premium if not fitted.
On the original issue of Ultraseal, it's beneficial when a slow puncture occurs which is a different scenario to that promoted by Tyron.