Yes, there is and it is called TCA Tandem Hospitality Homes. Tandem Club of America has a description of the program on their website at
www.tandemclub.org. "A Hospitality Home provides touring cyclists a place to stay for a night It need not be fancy, a spare bedroom or tent site will do. The cyclist will need shower facilities and an opportunity to launder their clothes and a meal."
I've been a warmshowers host for more than five years, and have enjoyed every passing cyclists' visit. The only tandem I have had overnight was the best - it was a Canadian family traveling on two tandems and a tag-along with their boys, ages 4, 6, and 8. They spent 18 months on the road traveling from Canada to Mexico along the coast, and back thru the midwest. It was a pleasure to be part of one night of their journey!