This is a very gray area. Clearly, you are using your RV for business. That indicates mileage between parks and depreciation of the RV.
However, since it is your main home. a business office can be tricky. You would have to have an area designated for regular and exclusive use to claim home office. See Can You Claim a Boat or RV as a Primary Residence ... Your RV is a business asset while being your home. See Publication 587 (2018), Business Use of Your Home | Internal ...
Your RV is your business lodging. You need to keep track of business nights use for business lodging.
For the business car section, add everything like you would a car;
- Motor oil
- Gas
- Car Washes
- Tires
- Licensing Fees
- Property Tax
- Parking
- Tolls
For more on depreciation: 26 U.S. Code § 280F - Limitation on depreciation for luxury ...
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