There are two different gas appliances so to speak, high pressure and low pressure. Your standard home 4 burner Jackeroo BBQ from Kmart is a low pressure appliance, hence it has a regulator to drop the gas pressure as it comes out of the bottle to L/P. I think gas bottle pressure is around 800-900kpa and the reg will drop it down to about 3kpa but dont quote me on this.
Your Gasmate gas stove that you have in the camper trailer is a high pressure appliance, hence they do not have a regulator in the line from the bottle to drop the pressure instead they use a very small hole in the form of a jet which is located behind the on/off and temp control knob to control the amount of gas being delivered to the burners.
Dont ever remove the regulator from a L/P hose and light the gas or as said above we will be reading about you in the papers.
From the Elgas web site:
The pressure within a gas bottle can be 800-900kPa. This varies based on the ambient temperature, exposure to the radiant heat of the sun and the amount of gas remaining in the gas bottle. However, the required appliance inlet pressure for Australian LPG gas appliances is typically only 2.75kPa. So, a regulator is required to reduce the pressure and ensure a consistent 2.75kPa is safely delivered from the gas bottle to your appliances.