H145 is fairly tail heavy. Extra 'ballast' in the front seats helps to settle the front of the skids in the forward clamps a little better, as the tubes are much smaller than the clamp diameter. There's no soft padding inside the clamps so any movement can cause paint damage when going over rough ground.
In terms of safety, I'd assume the crashworthy seat is actually the safest place to be anyway, so no problems there...