Are there any rental companies that will rent motorhomes weighing over 26001 pounds?

I would like to rent one to take the driving test, to upgrade my class C license to a class B license, before I buy A prevost

The main reason I want to get the license prier to the Bus, I would like to title the Bus in Montana. From my understanding a Montana LLC puts you in the Commercial class and I only want a class B non commercial license My MVA will not let me take the test in a commercial vehicle

Any thought’s on this