I'm curious to know what kind of truck you will haul this car and trailer with...
The snatch block makes sense because you aren't lifting the car straight up. Most of the weight is still on the wheels so you will lift half of the car at a time. Like a shopping cart filled with 200-lbs weight; it doesn't take 200-lbs to push it. Once it gets going, some men have pulled rail road box cars with their TEETH! (Don't try this with your Thunderbird.)
I hope you have a loooong heavy-duty pushbutton cord and a good brake on the winch. The trailer will need two axles and electric brakes to haul that much weight. Be safe and good luck. - Dave