Add a 3.6 Onan Generator LP or Diesel?

We bought a Champion 3800 watt dual fuel portable generator from CW several months ago on sale for $599 with free shipping. It is about 110 lbs and about 1.5 " above the bed of our Ram 3500 pickup. It has electric start and 30A RV plug. I need to install plug on front of our Keystone Alpine 5ver so we can plug into FW to generator in bed of TV. It is small enough to put it in the front compartment if we wanted to but I would need help lifting in as DW is not an amazon. I plan to tee into FW propane tanks with a 25' hose extension for boondocking or can use 25 lb portable bbq tanks. It has a 4 gal built in gasoline tank if needed. Just an option for you to think about.