This is what I fabricated for my Champion 3100/2800 watt 75531i inverter generator. With the control panel directly in front of you, the 3100 has the exhaust (both engine and cooling) on the right side/end and the heat sink (and engine cooling intake) for the inverter electronics on the left side/end.
Welded this generator cage out of 11 gauge, 3/4" square steel, coated in Plasti-Dip. It's secured to the toy hauler's generator/battery tray with 2 large bolts and 2 large padlocks. The black "covers" can be configured for travel (all covers installed), fueling (remove top cover), or for generator use (remove both bottom, end covers). I've tested it in 105 deg temps and in the rain and the covers work great in every configuration. As for security, sure, you can still steal it. The point is to keep honest people honest. It's the dishonest folks that kept me from purchasing a Honda generator--lol!! Oh, BTW, this Champion 75531i 3100/2800 watt inverter generator is barely noticeable inside my toy hauler when running. When the a/c is running you really have to strain to hear it.