i just bought a used truck that seemed all fine(beside the fact that i had to jump the battery just to drive it off the lot,witch should have been a red flag alone) but after two weeks in the truck started to shake really bad on the highway and i looked at the tires and there starting to cup on the inner side of the back right tire and the rest the tread is down to the nubs. i guess my question is should i expect the dealer to replace the tires?? I did ask the sells lady before i bought it if they could replace them and she said no that i would have to take it as is but that shouldn't matter, correct?? I talked to the sales manager and he said that he would take a look at them but its been two weeks and he said that 700 miles is a lot of mile to put on it since i got it. And he said that they have alot of people looking to get things for free so without me taking it to him hecouldn'ttguaranteee anything(the dealer is 70 miles out of town 140 round trip) he also said that he already made andextraa chipped key for me too and pulled out an aftermarket alarm that theydidn'tt have the remote to so every timee it went off there was nothing i could do about it. please tell me anything that i shuld know for firepower when i take it in on monday

thank you