They can sell you anything. You can also sue them for a refund, but you will have to prove they knew about the bent or rusted frame.
Yes you should always get a report on a car if it's used (; I own a dealership
The cost of a bent frame really depends on the amount it is bent and the location. The price range varies.
I ha a bent frame on my 95 from hurricane damage they put it on a frame puller and its as good as new.
No. The most common way to tell if a frame is bent is if the roof is buckled.
The answer is yes, you can sue anyone for anything. However, whether you can WIN any lawsuit is a matter of whether you can convince a jury or judge that the other party was responsible for the problem (normally, it has to do with whether the other party was negligent in some way). However, if a car dealer sold you a car with a bent frame, you have a pretty decent chance of winning the lawsuit.
improper tracking
yes
Of course they can sell you the car. You can also sue them. In a very nice manner, Demand they refund your money or give you another car, and if they refuse then tell them you will see them in court. That very well may get their attention. But, you may end up having to sue. Document the damage to the frame and have either an expert witness or written notarized statement from an expert that the frame is actually bent. Your problem is proving to a judge they knew the frame was bent. That is where an expert comes in. He could testify they should have known.
nope, thanks for asking
Frame straightening machine
A auto body repair shop with a frame machine can repair the frame.