tax writeoffs for full timers who work from road

Despite the fact that I ran a business from my RV for over 12 years, I would not begin to offer advice on what YOU should do. I hired a very good CPA and sent him all of my income and all of my expenses. If he said I had to pay, I paid. If I got a refund that was a bonus (not sure I ever got a refund!).
Don't ask for life changing advice on a forum (any forum) as taking that wrong advice can bankrupt you. Seek legal accounting advice!