Disclaimer:i havent used this yet but i have the confirmation lol
I had booked a yukon xl with Hertz for vancouver and just for 2 days i would've paid 680.00 with all the taxes, fees and insurance(yes i know my own insurance or CC covers it but i would still be paying the deductible so $100 for 2 days is worth the hassle and ill be in a yukon xl in van so the odds of me causing damage are higher than normal).
I was doing some searching today to see if i could get something cheaper and no luck at the other sites. For the hell of it i searched hertz discount codes and sure enough i find one on one of those coupon sites. I copy and paste into a new reservation and it worked! the total with taxes, fees and insurance is now $365.00 all in
The code had stated it was a small business discount(which i am anyways) but i was a bit paranoid it would come up as a different company so I opened up a separate screen and signed up my business(free) and they gave me a new code which still gave me the discount and kept the cost at 365.00. There was no mention of having to bring proof at time of rental so im sure anybody could do this. Sorry if this was a bit confusing but it just saved me $300.00.
Go on the hertz page and its in the top right under small business
https://www.hertz.com/rentacar/reservation/