I think you really need a kitchen-type LPG tank or something a little like it, not like the ones in the cars. Can you imagine bringing a genset to the nearest LPG station to refill?
Isang point din na raise ko yan when I was discussing this with someone else - I told him mukhang gago naman ako kung daladala ko yung genset para magparefill.
Next question - why is LPG for vehicles cheaper per kg than kitchen type LPG?