--snip--
Ordinarily towing is $25+- /year premium for each vehicle insured
IIRC, so if you get the AAA type towing, etc. cancel the towing on
your insurance or you are paying twice. Also, w/ your insurance
towing, you have to pay for it & get reimbursed, but not w/ AAA, you
just sign the receipt & pay nothing!
--snip--

I've used my State Farm roadside assistance several times and have not had
to pay anything before or after; I don't know off the top of my head what
the limits are but I haven't hit them. It's a 'free' service (meaning of
course that the cost is rolled in elsewhere) but it's not a line item you
can cancel, afaict.
I do, however, pay a little extra for the roadside assistance that comes
with my cell phone plan, and as it has much stricter limits I would consider
it the redundant and expendable plan out of the two but for the fact that
they will tow any car that the plan member is with as long as the cell phone
is there as well. The last time I used it they located my position and got
the distance for the tow by computer... kinda weird, but that's the
technology for you. When I bought my Vanagon the engine was partly out of it
(not that you could tell by looking) but they towed it to my home no
questions asked because I was sitting in it and I had my phone. I keep the
plan for that reason; rental car, friend's car, whatever- doesn't matter,
they'll cover it up to their limits. The insurance plan only covers the
vehicles on the policy. Either way I haven't paid for a tow in better than
ten years.

Cya,
Robert