I think under these circumstances, I wouldn't consider another visit to them for at least 2 years, possibly longer. Still do the hotel and rental car, and the "imposition" factor is eliminated. You aren't putting anyone out.

The question to think about is "what did I get out of this visit" and just from the description, it seems that the enjoyment for you was not there. Your sisters seem to just have an additional person (you) to involve in their dysfunctional way of relationships.