From watching a special that aired before the season primere, he claims the car is 10 yrs old, they left for Vegas because of the stress of "outing" themselves in Utah and "No more wives". Then later, one of them said "Maybe in 10 yrs or so". Actually, one of the older daughters said she will not live her life like them, "One husband, one wife" for her.
Wife #2 is actually the ex SIL of wife #1. Yikes!
This is the only reality show I watch simply because the life style fasinates me. No different then the facination (for me) of Mobsters (no respect for life at all),ancient royalty, old West anything-I could go on. I should have been a history teacher!