EA and ES selection can vary by day and time of day. Predictions for a month away will be about as reliable as a month-old weather forecast.
On the ES, full size often means cars generally thought of as intermediate, but which, in rental car land, magically migrate a size: Camrys, Altimas, Saturn Auras, last year's Malibus. Maybe some Impalas and Sonatas - which the U.S. EPA classifies as large cars. Yesterday my full size reservation gave me a selection of a Subaru Legacy, a Subaru Outback, a Dodge Avenger, or a Ford Fusion (not at FLL). If you find a Volvo S60 or some SUV (if that's your style) think yourself lucky.