Sorry, there are many different ones out there, you really have to cut out the wire rack area that goes over the flame- otherwise you will heat up the wire rack significantly. (and most are coated). Sorry, I should have better stated that "prongs" I mean the wire rack "rack" area. The feet may have to be bent (or cut) depending on how your you want to do the setup.
Its nothing more than a shelf honestly. You can even cut down a large metal coffee can, but just be careful of the excess heat that your keeping inside.
Furthermore, I'd strongly suggest you not use white gas stoves within your camper. Just.. not ideal. That initial flare up, can be quite sooty, and can leave a strong smell.
Butane stoves are cheap (20 dollars) and take inexpensive fuel (while not as cheap per btu, its about 1.50 per can when ordered locally). Asian people use it in their homes all the time for hotpot, and some will even take it outside when frying fish or other possibly stinky food.