I bought a motorhome and rent it to a business as a dwelling and office. It is stationary at one address. What Type of Asset & Asset Class should I use for depreciation?

Schedule E states, "For vehicles, use the Car and Truck Expenses Worksheet" but since this is being used as a dwelling, it does not appear to apply. Residential and nonresidential real estate could beg an audit question about "real estate".  The Asset Class & Recovery Period for real estate is longer than one would assume for a motorhome. Choosing "Other" as "type of Asset" comes with a warning from TT not to use it unless you are very familiar with depreciation.  It generates the question of which "Depreciation Method" to use.