No we haven't, although I did read a post somewhere and the poster said you could do it if you were VERY careful. Maybe they used a hairdryer to soften the glue?
We wouldn't have a different vehicle since we tow a trailer, so it's always just our truck. I can see the point if you have a toad. If we were 'frequent flyers drivers' to FLA the transponder might be worth it. But we're pretty much on an every other to every 2 years plan. It only costs about $5 to replace the sticker so it's moot to us.
I wish they'd find a way to either nationalize toll passes (and pay per state) or at least give you the ability to add a state for a period of time, like the system FLA & GA have. We have the FasTrak that's good here in CA, it would be nice to have the ability to add FLA to it (for a small fee, of course) rather than get a sticker or a different transponder.
We usually put our FasTrak in the little silver envelope they give you that blocks the signal and stick it in the glove box until we need it. But yes, it would be a bummer to have your coach 'tolled' and then have the toad 'tolled' too!!