Visa Signature Hertz Benefit

[nj23]

Hello

I just got my CSP (yay) and anyhow, I'm booking a trip for late this month.  I saw on the Visa Signature website they have a "Double Upgrade" bonus that my rental period will qualify for (well, this could just be a Visa benefit).  So, an Economy would be upgraded to Full Size, based on availability, etc.  Has anyone taken advantage of one of these kind of promos?  How does it work?  My booking is for the Economy, but then when I actually get to the rental office at destination airport I say "Hey, I booked this and here's my receipt with applied code, etc.  and I want a full size car now!"?  That seems kind of lame like they can say "Oh, no Full Size is available so sorry". 

Sorry, I don't travel too often where I'm making my own arrangements so yeah.  

Oh, and quick side question, the rental company picks up the primary liabliity coverage (in most states) since I don't have personal vehicle liability insurance (no car), right?  Then the CSP picks up the supplemental damage?  

Just making sure.  K thanks! 

Thanks 

[DrZoidberg]

Basically you enter the code and the price of the full size becomes the price of the economy, hence the double upgrade. So you book a full size right there. 

[nj23]

Ok Thanks. 

I ended up just booking the car through SW's Rapid Rewards so I can double dip (CSP 2x + Rapid Rewards points).

Thanks though.