has a proprietary bolt pattern on the rims. You can pop on over to uhaulcamper.com and pay them money to open up the historical postings and will find the part number. Some UHaul
dealers will order the part for you. Others will accuse you of buying a stolen trailer. Other members have found some kind of old car rims that work if you add a spacer.
It also might be here if you search. It is a typical conversation for new UHaul owners.
Check it out. And congrats on buying a UHaul.