Trees in Nevada will not the Pacific NW type but smaller with a lot ranges thru out the state exception; Great Basin, Tahoe etc. One that hammocks sees things different than a ground dweller a little imagination and you would hang. Desert landscape more southern Nevada say around Lake Mead you might find a tree eight feet tall or less trick is to find another. Kayaking on the Colorado river there is plenty of non native tamarisk along the shores just keep looking. How would one hang on a bush that supports a hammock. Depending on where I have 2 straps 4ft and 9ft example find a very close boulder 2 slide a small bar between thru a loop connect to a tree that's one way. Most of the time is can locate 2 bushes strap of choice 9ft.
You will miss that 6ft height with a foot or two of ground but your hammock camping. Overall I agree Nevada is sparse even in the desert one can still hang in this state. Also Death Valley is possible.
Enjoy the southwest different scenery with its own beauty.