Questions about running generator in back of truck

Using BBQ cover as tarp. Expose only the gen exhaust if it is raining.

Note- higher rails on newer trucks than this long box 2003 Chev. No issues with exhaust heat here. Tool box had to go down off the rails or 5er front corners would hit it. Gen is higher so must go forward of hitch to not get snagged under the 5er. (So no tool box with a short bed truck )