Do what ever floats your boat in taking care of your own gear you paid good hard earned cash for it.
That said in my many years as a firefighter at the top of the Santa Cruz Mountains we used the Honda 2000s to power our portable Halogen Scene lights in everything from driving rain and wind to baking heat to snow. They sat on the side of the road running for 5-6 hours at a time with zero protection and when we were done using them they got put back in their compartment. Back at the station they got refueld and put back in the comparment after a quick exterior wipe down and the engine hours were logged for oil changes. We never had one break down, fail to start, or shock any of us.