IMO If the historic house is what you have always wanted GO FOR IT!!
You can find a place to store the RV, and if you can't let me know I'll
come get it.
The backyard would be the hardest part for me. I love to have a backyard.
They are great to just relax in or to entertain guests. Really that would be
the hardest part of my decision.
Good luck with your choice.