It will all depend on what type of genset your using and yes you can put a sound deading mat in side one of your boxes, same stuff they use for car stereo deading mats its work real good. Just have the�door vented for the generator and the exhaust pipe out the back of the bus and your fuel I’d have in a differnt tank in another compartment and able to fuel for outside. Use a F150 ford fuel tank for the genset. Mike�