Generator cooling air flow (VERY HOT)

I think you could get a grass fire going under a bottom venting generator. For a number of years we owned a ranch in south central Oklahoma and had set up a site for our RV, when we were there. One stop, I remember the commercial power, REA, was off so we were running our 4 KW Generac on our Class C. The grass under the generator location was beyond brown after a few hours of running. It had turned black and was charring the grass, with some smoke smell in the area, not from the exhaust. I moved the RV and fired up the crawler tractor and bladed off that area of any grass, then reparked over the same spot where the water and sewer (septic) hoses would reach. The grass in question was really weeds that were a foot or foot and a half high. Was glad to see the REA crew get the power back on later that day.