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Check out https://awardwallet.com/merchants/ to see what is the Merchant Category Code for U-Haul.
I just ran a search and depending on which location, it looks like U-Haul does code on your credit card as travel.
I would use a card like Chase Sapphire Preferred or any other credit card that gets a bonus on travel.
awardwallet.com
Merchant Category Code Lookup Tool - AwardWallet
On this page, you can find merchant category code listing for pretty much any merchant