tax writeoffs for full timers who work from road

I would like to suggest that soliciting legal advice (which it is, despite the tax component) from faceless/nameless strangers on open forums on the internet is unwise, as well as dangerous. I would heartily recommend consulting a CPA for this advice. You will not only NOT have to wade through a bazillion contrary (and mostly ill-informed) opinions to find ones you can use, but you will have advice very unlikely to be flat out wrong/illegal.

Yes, it is likely to cost you a hundred bucks or so, but as a small business owner married to an accountant with many years experience in corporate accounting, that would be money well spent just for the peace of mind.

You can deduct all the cost of your "home office". TurboTax has a very good online forum to ask questions on.

Can only say what we do. My DW is a independent contractor and manages a professional organization, for peanuts I might add ! we/she writes off several items.
She organizes and or attends several conferences across the country, travel mileage is taken, campground fees also but only while she is at or prepping the conference ,not all the time . She also meets with local Members meetings representing the organization and taking mileage ($.58 a mile) to those things also. Most of our travel mileage is deducted as she is always scheduling meetings along our travel. She also fly's sometimes out of state when its not possible to travel in the RV. SF to NY for example ,If those expenses (air car rental hotel )are not reimbursed they are all written off. We do not use the RV as a office expense ...or depreciation just too much trouble.My weak understanding is it causes issues when you sell or trade the RV Her non employee contractor income is low enough that its almost all written off with just those small items .Most of what she does is like a volunteer being reimbursed
We had a tax consultant go through all the items the first year she started her "job"
I agree you should also.

Do your taxes on Turbotax. They'll guide you through it.

The rule is "related business expenses".

Examples: A room converted into an office devoted to running your business. Proportionately tax deductible calculating from total rental paid or the depreciation of your house.

Gas to deliver your product or meet the client. Again, proportionate cost in depreciation if you are using your car for your business.

I don't know how campground fees can be deductible since land is already part of a lease rental in an alternative scenario that you are renting an office or a factory for production.

What does you tax professional say? A CPA or EA I would hope.

Yosemite Sam1 wrote:
The rule is "related business expenses".

Examples: A room converted into an office devoted to running your business. Proportionately tax deductible calculating from total rental paid or the depreciation of your house.

Gas to deliver your product or meet the client. Again, proportionate cost in depreciation if you are using your car for your business.

I don't know how campground fees can be deductible since land is already part of a lease rental in an alternative scenario that you are renting an office or a factory for production.

In our case during an event campground fees are no different than a hotel rental while attending a business conference . we do NOT deduct year round campground fees, only while at a specific event.

thanks to everyone who has taken the time to answer my question. to be clear, i was looking for ideas, not legal advice. interestingly, my tax guy is less informed about this issue than many of you are. I think my main take-away is that i will not be deducting any rv parking fees, fuel, maintenance, etc, with the exception of a specific destination we visit solely for business. in that case, we rent a car, pay for client lunches, event fees, and an rv park. i will deduct those.

Whether you have a home on wheels or a stick house the tax consequences would be the same.

Among the criteria for making a home office deductible is that the office must be used exclusively for business and only that portion of the home may be deducted. For example, you actually have a dedicated office of 200 square feet in a 2000 sq ft home you can apply 10% of the utility bills and using a depreciation table for value of the home taking 10% of that depreciation for business expenses. However when you sell that home you have to recapture that depreciation as a long term gain (assuming when you sell the home and allocate 10% of the sales price to the office the amount is greater than the depreciated value of that office, which will be the case if you sell your home for the purchase price or greater).
If the RV is your only home, the first stumbling block will be dedicating a portion of the RV to exclusive usage as an office. The IRS will likely disallow such a claim unless the office is in a separate room.
In my opinion, it would take a really unique business situation to make it worth the while for a full timer to try and make a portion of their RV a qualified, tax deductible home office.