Heck, I can't even see the point of buying a generator, Chances are You already have one.. You may even drive it everyday... Just Get an inverter, 12vdc to 120vac...

Puts out enough amps to keep an electric space heater going.. No worries about CO2 that way..

Heck if Your real serious about it, dual battery setup in Your rig...

Unless You want to keep the whole house running for some reason,, Just to prove You are prepared I guess..