Chariot usually comes up for a car. I can't think what card would come up for selling or buying - definitily a pentacle - maybe the Ace of Pentacles and the Chariot is whatis coming to me now. maybe others will have other interpretations.
The suit of penticals represents material things, sometimes the suit is called coins.
In regards to a house or car, that would depend upon the other cards. In the Legend deck the 3 of spears sometimes means trade/negotiations.
