Generators...What do you use at the track?

Right now I have a Champion 3000/4000 watt generator(hey it was cheap).It works great for what I need,but it's loud.I travel to different tracks for weekend events and am looking for something a lot quieter.On cold nights I run my generator all night for small heaters.What are some of you using?I,m looking for something light,with wheels that will run all night.(at least 7hrs on a tank).What do you use/have?Thanks