Okay thank you sky121, I appreciate that.
Does anyone know if the free upgrade is guaranteed, if I order a full size will I be able to get a standard SUV, (which I think is the next level)?
When I put in my dates the total came out to be $157 which is more then fox and sixt, but if I can get the free upgrade it's worth it.
Thanks
P.S. Someone mentioned before that national is not trustworthy and a lot of times doesn't have cars, my flight gets into MIA about 10:30pm, and I am traveling with two kids so the last thing I need is to not have a car available.