Dave, I had the Rivco engine guards installed before setting out across country from Florida to Washington. I had a fully loaded "tip over" in Bowling Green, KY and they did their job. Most engine guards are designed for low speed drops or tipovers. The best part about the Rivcos is that they are sturdy enough to mount highway pegs without moving.
The original stock Triumph guards were weak junk but I understand they have been improved. The rear bag guards are more cosmetic than functional. I had some and sold them with my stock bags. I thought they looked good and believe they'd work OK in a tip over but in a slide or some serious mishap would probably fold up.