tax writeoffs for full timers who work from road

I traveled in my RV for over 12 years and wrote off nearly every expense. I could verify the travel was required. We traveled from RV show to RV show and setup a booth and sold our goods. If that's the kind of business you are doing then it's pretty simple. If you plan to sell stuff on E-Bay and you claim all of your travels and camping were a required part of your business, you are either going to have to pay and pay and pay or go to jail!