Haven't seen my solution posted here. I purchased 5 rubber mallets from Harbor Freight.
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Drilled holes the length of the hammer head with extended length drill bit and then used a 1/2" wood bit to drill about an inch deep. Purchased longer bolts from Lowes and added washers under the bolt head to provide better base for tension. Mounted 33" tires - MT Baja MTZ and BJG KOs perfectly.
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Driver's Lower
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Passenger Top
Cut off handles and turned to inside so you can't see the wood in the head. Installed over 10+ years ago. These things are bullet proof.
Edit: The 5th hammer? It's the one I am holding in my hand. They are cheap and needed one for the garage.