That's a lot of miles by non-owners who probably drove them hard & with little TLC. CA might have changed oil as regular as they could, but would bet no where close to recommended intervals.
If you have a PPL dealer where you are, check out their inventory. I purchased 3 bumper pulls & 3 5th wheels, never had any troubles with any of them. BTW prices are not set in stone with them, make offers.
You didn't mentioned price range, I would think there's better deals out there. Keep hunting & good luck.