On my first trip out west to Vail in 2014, they put me on Rossi E88's... which was by far the widest ski I'd ever been on. I asked if they had anything narrower, and they said they did, but the 88 was actually pretty narrow compared to what they were mostly renting. So I took it and skied it. It was fine. I'd have probably been better off on something narrower though.
On my last trip to CO, I decided not to take my skis with me. I didn't feel like lugging them with me to/from Heathrow, and with with the heated discussions back on EpicSki at the time about how rental shops in CO were putting people on skis that were too wide, I thought it would be easy to just walk into a shop and find something 80-90 mm, which is what I like to ski in the conditions that Summit Co had when I was there.
But, I had to go to several shops before finding one at Copper that had anything similar to what I was looking for. I ended up on a pair of K2 Pinnacle 95's. I would've preferred the Pinnacle 85 for the conditions that week, but the shop didn't have that wide a selection in terms of styles of ski. It was either the Pinnacle 95 or something below 80 mm with a lot of camber and metal, which all of the shops I went to had plenty of.
Maybe Vail is different. But from what I saw around Dillon, Frisco, and the shops at the bases of Copper and Breckenridge, those looking for sub-80-mm directional skis were spoiled for choice. Those looking for twin tips or something wider had a limited selection. They had them on the sales wall, but not on the rental racks.
From what I remember from my trips to SLC, the shops there had a wider variety of skis available to rent, but it was still easy to find sub-80-mm directional carvers.