I assume the idea is to stay in the camper and hook it up to a natural gas connection.
Given the hassle and issues of converting to natural gas, if you're staying in one spot, I'd suggest looking into propane delivery in large bottles - I'm told (haven't tried it yet) you can get the bottle delivered and refilled for just the cost of the propane. Plus if you want to use the camper normally later, you'd have to switch back to propane jets.
Make no mistake - you'll go through propane like there's no tomorrow. I kept our trailer heated, at the lowest setting on the thermostat, for about 3 weeks last winter, and it wasn't even that cold outside. IIRC I used more than two full 30 lb bottles of propane.. and this was in the relatively mild Washington, DC area weather. We covered the skylights and closed the bedroom door, too, since there are no water lines back there. I opened the cabinet with the water lines and the water heater to help get warm air into those areas. I promised myself I'd just re-winterize if I was going to do that again.
But this year we're doing it again, so I have to decide whether I'm keeping that promise.