The stated purpose of tyron bands is to stop the beed of the tyre dropping into the wheel well if the tyre deflates. This was an issue with some older designs of wheel rim, but most modern rims have retention features which broadly do the same job as tyre bands rendering the bands virtually redundant under normal road conditions that 99.99% of caravanners would use.
With the push from insurers and industry watchdogs to improve car safety, if these bands were a real benefit, there would be far more products of a similar nature being offered and used. There aren't, so that must beg the question why not?
If you review the manufacturers own published material, non of the examples they show or claim are likely to occur to the normal caravan tower. The examples of blow outs are far more sever than would arise in normal motoring.
There is a case for this type of system for emergency vehicles where a puncture or deflation may compromise a security issue or rescue mission, but for normal drivers and caravanners no.
If you think you need them on your caravan then you should also have them fitted to your car!.
The lack of any competition to the product is not explained by patent protections, but its probably more a testament to realisation that the product does not provide a significant benefit to most drivers.
Let me stress, if you want that sence of extra protection then fine, but so far, and despite asking on several occasions no one has been able to show these or similar bands offer any real benefit to normal caravanners.
Perhaps if you were in Austrailian out back miles from help, they may have a practical use for these bands, but in the UK and most of Europe,I cannot conceive they will add any real degree of safety, and they will reduce your paylaod margin.