We have a trust. The cars are not in it. they are in my husbands name. Is that a problem?

Cars are typically not a problem as the California DMV has very easy forms to fill out 40 days after death. Just make sure your husband's will specifies who gets the cars at his death (presumably you). To make it easier he might want to add you on the pink slip though! Then you don't have to wait 40 days after death to transfer them. The bottom line is that there is no need to transfer them to your trust.