Had some photos but had difficulty getting them off my phone here. Can provide a brief narrative instead.

Monday 6/6 @ 10am:
Executive:
3 x Malibu LT
2 x Impala Premier
2 x Nissan Altima
3 x 300 S
1 x Nissan Frontier
1 x Nissan Rogue
1 x Nissan Kicks
1 x Mazda CX30
1 x Chevy Traverse
1 x Mustang Convert.
1 x Lincoln MKZ
1 x Buick Cascada Convert.

Aisle:
3 x Elantra
2 x Sentra
1 x Frontier
1 x Ford Edge Titanium
2 x Nissan Rogue

Plenty of Vehicle Selection across the board. Most people were going for the SUV's. I sat for about 10 minutes to watch and the Lincoln, Traverse, Rogue, Impala's, and a 300S were taken. I took the Kicks. Right size for my luggage and where I needed to drive. Alamo was bursting at the gills with about 30 Jeeps (Wranglers and the like I think - actual Jeep looking Jeep's) lined up in the spaces and aisles in their Jeep section and about 10 at Enterprise. A few people asked about them from National but no dice.

Later that afternoon had to swap out the Kicks for a Mechanical... there certainly was far less selection than there was at 10am:

Monday 6/6 @ 3pm:
Executive:
5x Malibu
2x Impala
3x Altima
1x Nissan Rogue (low mileage) - promptly taken while I was there

Aisle:
1x Ford Fusion SE
1x Sentra

I was given a Jeep Cherokee for my exchange. They asked if I wanted the Rogue but just went with the Cherokee as it has more of the layout I am used to (UConnect). They were pretty much trying to keep me in an SUV as I had an SUV/Crossover the first time. Very easy exchange and friendly staff. Out of the 40+ Jeeps between Alamo and National only 6 remained at National and none at Enterprise. The midday flights really ate away at those.

Overall I was expecting the worst but was pleasantly surprised with the selection as they had been showing "sold out" since I booked a few weeks ago and I could only get a reservation being logged in as an EE. On to HNL tomorrow which I take will be a very different experience.