[WASCWatch]

But do private aircraft have a method to determine if the weight distribution is safe prior to takeoff do you know?

Yes. Add the weight of the plane, with fuel; and, the weight of all the people and cargo. As for balance, every plane manual has a chart that lists the center line for weight and balance. There may even be a decal on the interior of the plane. The problem here may be both weight and balance. If the plan crashed tail first or nose first, balance was a big part of the problem.

[mylife]

looks like it belly flopped.