Rap... on a technical point, would a half Irish Canuck be subject to 1 500 N? Further, is there a limit on live loading cycles and does this have any impact on the allowable load; is there a factor of safety (I assume any such factor of safety value would be a minimum of at least 2.0 given the unknown variable of impact resistance in an attempt to ensure the safety of the roller(s).) or has this been taken into account in the initial analysis and conclusions?