Having installed quite a few car seats on rental cars (all from hertz) i can not possibly imagine how it may take 1.5 hr. OP's frustration is understandable but stems primarily from to assumption that hertz would preinstall seats. USA is the land of lawsuits (some just, some rather frivolous) so unfortunately this is a side effect.. .
Those who push the idea of bringing own seats can perhaps explain how that would be practical for OP who struggled with existing luggage as is...
Speculation that somehow rental car seats are damaged/expired is nothing but fearmongering - we've been through this discussion quite a few times on this forum.
Dirty - possibly although with hertz i never encountered that - they were almost always brought in wrapped in plastic.
Furthermore for OP - using AAA CDP (1 will do) still includes one car seat for free - no need to pay $7-10/day. Posting those questions here ahead of your trip could have made it much easier for you. Cheers.
Last edited by azepine00; Aug 4, 2017 at 11:00 pm