I often rent in TPA as well (I'm local) and yes, the Rav4 or the occasional Highlander or Kia of that size are normally what is in the Mid size SUV area. Ea is normally midsize or larger domestic Chevy's and such and the Executive is pot luck depending on the day.

I rented on Monday and the Exec had an Xterra, FJCruiser and Forerunner in that area. Yesterday upon my return, there were no SUVs but several minivans in Exec. I went with an Impala SS that I have no business renting let alone driving!

As for the Volvo, I believe they are full size SUVs or "special" of some size which means they won't be in any section to choose. Tampa likes to keep all of the special cars on the upgrade isle right in front of the doors. That being said, I have yet to see a V70 on the lot in Tampa.

Christmas will be peak season here so the pickings might be slim if you want something in particular.

Best of luck!