I've stopped at the Donner Summit rest area on I-80. That is also where the truckers stop. Note that this is a few miles from Donner Pass on old U.S.40, which is a few miles from the original Donner Pass where the Donner party actually crossed.
Of course, the Donner party didn't have any 18-wheelers to park overnight.
I do not recommend stopping at Donner Lake. I've been hassled by the local cops there.