Well, we had t use them a few weeks ago coming up on hwy 77 in south texas.
blew/disintegrated a trailer tire on a very busy stretch.
at least five leo folks passed us...no stop
called coach net...very nice lady pinpointed out location and said a tech would be out within the hr.
i went out and broke out the spare and no sooner came back in the bus, than a real nice fella showed up to do the change.
just under 25 minutes...from call to arrival
took the guy about 1/2 hr and we were on our way