Ron,
If you already have Tyron bands, then get them refitted - they are an OK safety feature, but I totally agree with Lutz - there are better solutions
The special tool is an allen (hexagonal) key, might be a good idea to make sure you carry one (of the correct size) in the caravan tool-kit, then if you have a puncture in, say, France you can have the Tyron band removed without the tyre fitter wrecking it.
And Tyron bands are not a reason to exclude checking the caravan tyres for damage, nails in the tread, or incorrect tyre pressure
Robert