Car auctions are:
1) For dealers to junk crap.
2) Flippers to sell flood crap.
3) Auction flipper that buy low then run the price up at their auction.
4) Gov to sell surplus and confiscated crap.
5) Banks to sell repros.
Go to the auctions an just watch a few. You'll see the same cars an people. As for dealer only auctions. Near me the "dealer" e-mails a list of what is for sale with car vin an car fax numbers. Normally cars five years an older or foreign stuff near me.
I bought a Range Rover that the milage didn't match the car fax or dealer maintenance records. The bastard (Dealer) had rolled it back. Never trust a damn thing at an auction. Buy a OBM II reader an pick one type of car to start with.
Treat any auction like a slot machine. Never put more in then your willing to lose. I've seen $10,000 cars blow engines leaving the auction while $300 beaters are doing 80 MPH on three bald tires.
If you have a truck find a deal on a car dolly.