Leaving Nor Cal in Early March

I'm thinking that's a pretty good idea and maybe would even shorten the trip up thereby giving us more time on the return with the good weather.

What might I expect to pay for a truck and fifth wheel? Best places to embark and dembark? Cheepest? Am I going to be able to find a spot this late? I understand it can be quite full. However we're obviously very flexible and I suppose headed up earlier than most.