I do not full time, but my husband and I have a travel trailer and travel extensively throughout the summer. I agree that the person with dementia will not know when to stop driving. It was a struggle to get my husband to stop driving as he did not see an issue even though his short term memory and concentration was severely affected, but finally with the help of the health care professionals, he finally agreed. We continue to camp but I do all the driving and make sure I know how to operate everything to do with the trailer and I double check everything he does to make sure nothing is forgotten
The other issue I have found is that he cannot remember where we are parked, so whenever we leave the trailer, I have to be with him. He cannot even walk around outside by himself off of our site because he will forget where we are parked. We make the most of it and as long as it is still enjoyable and not too stressful we will continue to go know that in the future we will probably have to stop.
Most important have a plan in place for when you have to stop.