Going to be in the Death Valley area in mid May. Can you drive through the park in a 40' RV with tow comfortably without problems coming from Beatty, NV to Lone Pine, CA.
If you're coming in from the east (pahrump) I would go on to Furnace Creek and camp there. Then use that as a base camp and use the jeep to explore the rest of the part. When leaving for good, recommend going down to Baker and I-15 (as I mentioned in my previous reply).