SERVO Help - Custom Build

[kladal]

Hello,

I have a custom build that will only barely resemble the truck you see in the pictures below by the time it's complete.

Here are the specs:
-Motor = 2217 2y 640kv CC/Neu
-ESC = Megapower 120A
-Battery = 10s (two 5s)
-BEC = Castle Creations BEC Pro at stock 5.5V
-Tires = IMEX Swamp Kong 8.5"
-Weight = estimated 22-24 pounds

I will be installing TWO steering servos for four wheel steering. I've been advised that I need a high-torque servo.

1. Any recommendations on how much torque I should have? (Thus far I've been considering the Futaba BLS352 OR SAVOX SC-1256TG).

2. Which between these two uses less power?

3. Does anyone recommend any other servo?

4. I've been told two servos be linked via a y-hardness. How will they each attain sufficient power??

5. How do I connect these so they each do the opposite?

6. Does anyone see any problems with this steering system?

Thank you for your input!

(When I asked a servo question in my other thread, no one responded).