Yeah, i dont know much but i do know that getting a Telluride (and i think a Palisade) is not easy- they flew off the lots in many suburbs. Cant imagine any of them are going to be sold over to rental car companies anytime soon, when cheaper options abound (ie, the Sorento and the Santa Fe).
I just picked up an SUV from a Hertz city location- there was a brand new Nissan Murano sitting outside next to a not as new Mazda CX9. Both had HERTZ toll passes in the window but the employees looked out the window with me and said they weren't entirely sure they were Hertz vehicles, and sent me off with an older but still nice looking Ford Edge. Not a big deal but can't understand why, time and again, company after company, the people that work there don't jump at the opportunity to rent out the cars that are requested...