Apologies in advance, but this is going to sound a bit harsh....
Congrats on having been able to be considered for a position. It sounds like you're being seriously considered, given that you've made it through phone screenings, a phone interview, and you have multiple people submitting references on your behalf.
If you are NOT serious about taking a job 4 hours away from your current location, then please stop wasting people's time. It takes time/effort to interview candidates for positions. It takes time/effort to give honest, meaningful replies regarding reference checks.
If you were not willing to make the effort/spend the $$$ to interview for the position, then why did you even apply for it in the first place?
This decision should have been made loooooong ago.
If you decide to go ahead and interview tomorrow, and you do manage to get the job, would you be able/willing to uproot yourself, move, and establish a new residence 4 hours away? If not, then please stop the interview process now.