OldManOfTheSea, Alex,
Based on that NJ Tahoe seller location and the PPV's color, I believe those Tahoes are decommissioned NY State Police Hi-Way patrol vehicles.
The decommission rule of NY State Police Hi-Way patrol vehicle was 3-year service and 150K miles (whichever comes 1st). Since budget issue, now those vehicles have reached to 200K-up miles before auction.
I went to NY State auction by myself, and bought 4 PPVs over the time, two 1996 Chevy Caprice 9C1 LT1, one 1999 and one 2007 Tahoe Z56.
You need put certain amount of money aside as emergency maintenance and cosmetics budge due to hi-mileage vehicle, also you must be mechanically oriented.
When you go to Tahoe PPV dealer, check followings:
Spare tire, jack set, spare tire lock and its (small plastic piece) cover are there; rear passenger doors can be opened from inside; rear windows are operational by pressing buttons on rear doors; NY State Tahoe PPV has dual battery setup, make sure 2 batteries are there; horn works, headlight hi-beam; rear center hi-mount stop light (which is part of wig signal some times); NO open roof top hole; Check the vehicle title: salvage or not; .....
A lot of PPV accessories were coming with the vehicle you purchased, like passenger partition, push bar, trunk organizer, rear light bar, wig signal flasher, ... Now those items are removed from vehicles before auction, and they are sold separately.
The NY State Fleet preventive maintenance schedule and requirement are very managed. You can get a copy of brief maintenance record of the vehicle you purchased from auction through NY State government web site as public info disclosure.
After you purchase Tahoe PPV, please let us know if you want more details.