There are three heaters in the Buddy line. Little Buddy, Buddy, and Big Buddy. The Big Buddy used to have a quick connect port for a hose that could be connected to the low pressure side of the propane feed. This would allow you to plumb in a hose inside the RV from the cook-top, furnace, water heater, or fridge. I don't see that mentioned for their current model.
I have the Buddy that I use in my 24ft motorhome and it works well. I removed the built-in regulator and attached a hose that is plumbed into the line that feeds my cook-top.
I would think that the Buddy would be large enough for your needs. If you do not want to remove the built in regulator there are hoses available to connect direct to a propane tank.
