Built in quiet inverter generator for truck camper?

I have seen people spending 100's and even 1000's hours on project of very little value, only becouse they enjoyed it, but for starters all portable generators are gasoline-powered.
Gasoline fumes will never be safe and the only way is do the Venturi pipe over the roof.
Did I say how much moving generator weight from rear of the camper to front hitch mount helps in rig stability?