Yep the RAC have a limit, I think it's 5 or 6 times in a year. I know that 'cos that's how many times the Cossie has required RAC rescue this year
They wrote a letter after 5 times (or 4 maybe) warning they would start charging soon, then the next time I got a letter saying that's it I'd be charged if I called them out again this year.
Top stuff if you ask me!