You need to check with car rental agencies and see if they have locations in Havasu. You can do this online on their web sites. Likely Enterprise does but probably not the majors. What do you plan to do after dropping off the car? There do not appear to be scheduled commercial flights to/from there.
Hertz and Avis are located in the airport terminal. Enterprise is on the north side of town on Acoma, I think.
I've rented at the airport and they are very friendly and accomodating.
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