The difference between the two.....one keeps the tire from coming off the rim (Tyron) and the other basically gives you a secondary tire (internal rim/wheel) that gives you something to drive on, versus the rim. It would be kind of like a donut tire, but not rubber, inside the RV tire. I think both are VERY expensive, but the Retroband is the better system.
I assisted with the demonstrations of the Tyron bands when they were first brought to the US from Britain. They were introduced on the west coast and I provided the explosion (blasting cap inserted in the sidewall) that popped the tire during the press conference. My partner and I provided the explosives for the three demos on the west coast. They sold about 500 units to our Department, which installed them initially and then ended up tossing them in a pile. In law enforcement, the life of expectancy of a police car tire is only a year or less. They made it too hard to change out tires.
The Tyron bands worked by filling the center hole of the wheel, so the tire could not come off the rim.
Just keep in mind, these DO NOT prevent blowouts, they're job is to provide drivability after a blowout. Both units are really designed to allow you to continue to drive for awhile after a blowout. The Tyron bands were a big seller with the British military, an organization that may need to drive a distance on a flat, versus an RV that you stop quickly.
