Question: is a 2 ton floor jack enough?
Answer: Since the jack stands are rated for 2 tons (4,000 lbs) you should be good to go, especially since you're not technically lifting the entire weight of the car on one corner. Yes, you should be fine. 2 tons is 4,000 pounds. So, if your car weighs 2,500 pounds, you should be ok with a 2 ton jack.