This is my experience with 3 different Champion generators.
1. Champion 3500 watt open frame. Has a great RV plug and runs everything. Always felt like I needed to drag it 500ft because of noise. Heavy, sold it.
2. Champion 2000 watt inverter. Nice and quiet, light weight. No RV plug so have to carry adapter. Have been using this little genset for 6 years. Struggles at 9000 ft and up with micro and or coffee pot. Will not run AC. Am keeping this one around. Great for charging batteries.
3. Champion 3100 watt inverter w/remote start. Runs everything, quiet, doesn't struggle at 9000 ft and up with coffee pot or microwave. Have tested AC at 9000 ft and it ran fine. Remote start is an added bonus on those cold mornings. Hit the key fob and coffee is perking. DW likes the remote when cooking and ease for microwave use. A little heavy, but teenage son helps put it in truck. DW and I can manage it as well.
Hope this helps!