A 2013 vehicle.....I doubt there has been very many towing miles put on one yet to give any kind of opinion.
I have a friend that put 110,000 towing miles on his tracker that was suppose to be started every couple of hundred miles, he never did. It was still running fine when he gave it to his nephew.
If it were mine, I would start it when I stopped at a rest area to walk the dog, or get a smaller cramped Fiat. But what do I know, my toad is not even rated for towing :)
Another idea, you could have a remote start installed, then you could run it anytime you wanted to without getting out of the MH.