Do your research about weather conditions for the Mojave during December.
While it may seem like a sensible time, Dec can be a rough time to be in the high desert. The weather can get very cold at night (in the teens), and we get a lot of blustery winds during the winter months, which can sometimes reach gale-force and last for days. The winter is also the wet season, so depending on when the rain fell, the water crossings may be higher than average, and if your timing is off, you could encounter flash floods, which are not to be trifled with. Make sure you have a reliable heat source/winter sleeping bag/extra blankets and good shelter from the wind. The weather is very unpredictable to it pays to be prepared for the worst.