I don't really use them in readings but I'm curious to see if others do. You could probably use them as signifiers if you read with signifiers which I never tried.
Mine are the Moon and the Hermit and I can probably say that because of this I'm more inclined to interpret the Hermit in readings as relating to me. Especially that it's also a card related to my sun sign, Virgo. And I feel like I can relate to both of them quite easily. Do you think the Chariot and the Tower are fitting for you?