at first the weight on the bumper was 2 adults about 400 lbs. Then I used my tractor with the bucket and put down pressure on it. You can experiment with the weight and see what it does. Try bags of sand or something equivalent.
I decided to stick with the lifting the body instead, but I reconfigured it using the ladder idea. This puts the force more vertical, which (I think) will have less chance of damaging the window frame. Seemed to work better.
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