DW wants to learn to drive our 5er...

My wife said she didn't want to drive but thought she should be able to, our TT was only 28 ft then. She said not in town or in the city only the interstate. One day I said my back hurt would she like to drive and she said yes if I get her to the interstate. On the entrance frame I got out and in the back seat to lay down, next thing I know she is asking if she should drive all the way home or would I like to stop for lunch. She only had to try and said it was nothing. She still won't back up but doesn't mind driving in the city or heavy traffic with our 34 ft TT.