A FlyerTalk Posting Legend, Moderator, Information Desk, Ambassador, Alaska Airlines
Join Date: Dec 2006
Location: FAI
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Posts: 42,953
It's always good to have a reservation in place as car places can and do sell out.
As mentioned previously, generally there are no penalties attached to these, but always check the language before agreeing.
And one can always try to upgrade, assuming there is inventory. But again YMMV for the deal you may have.
<mod hat on>
As this is specific to rental cars, we'll move this to the rental car forum.
~beckoa, co-moderator Information Desk