I rent frequently there. The typical 'Mid Size SUV' is the Rav4. There are tons of them. There are special sections with overhead signs that will say "Mid Size SUVs" etc.
If you are Execuitive, there may or may not be Rav4s in the Executive aisle. No matter, I just walk and take a RAV4 further down in the SUV area and have never been stopped. I Like BIG SUVs. Occasionally I find a Tahoe or two in the Executive aisle, but that is infrequent and sometimes I find biggger than a RAV4 but smaller than a Tahoe. It is always a guessing game.