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do any vehicles in the 40k universe have their own personnel stealth field generator?

Tau Devilfish Troop Carrier does.
But only in Dawn of War, as far as I know.

Would Eldar holofields count? Admittedly I don't know if they'd count so much as "stealth" fields, or if they're more intended to confuse enemies who've already seen them and are shooting at them.

Tau Disruption Pod is a vehicle upgrade for any Tau vehicle (including Tanks and Aircraft). It masks the pressence of the vehicle giving it a mobile cover save as long as the shooter doesn't get too close.

Tau also have a more potent version for some of their battle suits and drones that renders them totally invisible beyond a certain distance.

Eldar holofields DO count, but they count better for moving vehicles (at least in the original fluff).

Harlequin jetbikers used to have the same holofields as the foot troopers.