CrossRoads Cycling is the ultimate place to go for the ride across the United States (Los Angeles to Boston). Accomodations are larger, well known hotels, with quality meals (many buffets ... you'll deserve seconds!), and SAG support. There are also shorter options such as Southwest (LA to Albuquerque), Middle and Eastern US. They encourage riders of all levels and paces, and many guests use this ride as a fundraiser for their favorite charity. Just in case you were wondering, the tour to cross the country is 48 days.
usa - cross country tour