We spend our summer at a seasonal site. I own my own business (no employees) and work out of the house. During the summer, I work out of the Motorhome. I do not deduct any house expense or RV expense. At home, my office is shared by the rest of the family and doesn't meet the requirements set out by the IRS. Since I use either the dinette or a camp chair to work out of while in the Motorhome, I don't think that meets the IRS requirements either.
My understanding of travel expense deductions is only when traveling to and from a customer. If you were traveling to a campground for a customer, you could deduct it. If you were traveling from one campground just because that's where you want to stay, I don't think you can deduct it.
-Michael