Calculating support forces on each tire

[boardaddict]

Homework Statement

Two uniform crates of 350kg are placed in the bed of a stationary 1500kg truck. Determine the support forces at each of the wheels

The dimensions are only around the horizontal axis

Homework Equations

Fx = n1 + n2 -M1g -m2g-m3g

T= Dmg

The Attempt at a Solution

Thats about where I am at, I am just looking for a hint,

 

[tramar]

Add mass of crates and truck -> find gravitational force -> divide by 4 (force is split over 4 tires)

 

[boardaddict]

Add mass of crates and truck -> find gravitational force -> divide by 4 (force is split over 4 tires)

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If it was uniform that would be right but its not uniform. This is what I came up with:

Find center of gravity, Calculate torque, using that the sum of all forces has to equal total mass it should cancel out, any thoughts?