If you have credit card debt - don't buy a new car. Get your credit cars paid off first. I fell into that trap many years ago and swore I would never have another credit card balance. A lot of hard work, budgeting and choosing to live below my means has resulted in now almost 21 years of being credit card debt free. Best decision I ever made.With all those other purchases, there’s an argument that you should put LESS down on your Telly and use that $15k for other more useful needs. Car financing will be cheaper than credit cards and mortgage.
As far as mortgages - that is tax deductible - so an apples to oranges comparison. Also - a house is (generally) an appreciating asset while a vehicle is not.
For long term financial security - don't carry credit card debt, keep a rainy day fund in the bank and pay off your cars as fast as possible.