One of the appeals to renting out the RV is to earn some money to help pay for the beast on a monthly basis. Another appeal is the possible tax depreciation that may be used to reduce taxable income. And finally the last that I can think of is the possible benefit of deducting portion of repairs and maintenance.
In order for a deduction to be allowed, the owner has to rent out the RV. They can still utilize the RV personally, but the expenses and depreciation will be taken in a ratio of business days vs personal days.
There can be a down-fall or drawback to renting the RV. A case by the reference of Harkins v. The RV Factory, LLC, No. 3:17-cv-00853 (N.D. Ind. 6/25/20) indicated how the RV was no longer covered under warranty because it was commercialized. A great read https://www.thetaxadviser.com/issues/2020/sep/business-deduction-rv.html