Do I need a consumer attorney?

It IS really shady. They are in the car business. Do NOT talk to them on the phone, ever again. DO make your payments, on time, to them, in a traceable fashion, OR they will likely come and steal (repo) the car without you knowing it. Do not be even one day late. Keep all communications, and do not leave any valuables in your car, as when/if they repo, that stuff will disappear like magic too.

I agree with the other response here and want to add a few things.

In Nevada, even if you sign a document saying otherwise, you cannot be charged excessive late fees for a late payment. Likewise, your car cannot be repossessed unless you are 30 days late on your payment. While the reality is that this shady car lot will probably try to charge crazy fees and/or illegally repossess your car if you are even a day late, just know that these are not legal practices (they cannot keep your personal property in the vehicle, either). If anything like that happens, you should call a lawyer or the DMV Compliance Enforcement Division as soon as possible.

With respect to the tires, you are entitled to those. Is that written anywhere in your contract? It should be, and the dealer has the obligation under the law to provide proof of the sale in writing, at a minimum.

Long story short, you should not be afraid of your car dealer. Nevada has strong consumer protection laws which govern car transactions for these reasons.

Good luck. I hope this helps