We really liked Fort Stanton/Snowy River Cave NCA too - it even brought back memories of limestone hills in Texas' Edwards Plateau. It eventually got too warm in mid-July while we were there but we plan to go back in cooler weather. In addition, the easy access to Capitan for supplies and Amazon locker deliveries at Brewer's gas station was convenient (I did some van repairs using some Amazon supplies we picked up).
At the time Rob Jagger's Campground was closed for an equestrian event unfortunately, so we ended filling up water in Capitan at Mama Bear's RV park for a small fee ($5 I think).
We have a Eberspächer fuel heater that uses gasoline rather than diesel fuel, and it is tied directly into our van's fuel tank. It seems rather efficient - over the course of a week below freezing we only noticed the gas gauge going down a little.