Can I trade my car in for suv ??

I'm sure you can if you get the right price for your car and you have good credit.

Yes, but would advise to shop around to get best price on selling your old vehicle and do the same before you purchase. I was able to get $1000 more for my vehicle from another dealer and purchased a new vehicle for a cheaper price than Carmax.

Yes

Yes. They'll buy it without you purchasing.

I dont know if they call it a trade in but they do buy cars