I'll bet Trump would resign if Pence post dated a pardon for him beforehand, but he would pardon his family first (fuck everybody else). That could be the basis for some kind of "deal", but I doubt it, Pence will want as much distance between himself and Trump as possible when it blows up, besides Pence has no idea what crimes he might be pardoning. Mueller, the DOJ and the democrats would have to be part of any deal and it wouldn't help the Trump bunch with the state crimes or civil actions. I don't see a pardon or a "deal" in the cards for the way this mess ends, looks like impeachment and prison or death. It'll be the doing of Donald or the death of Donald.