So the real question is how can Trump guarantee a massive working class turnout? With all due modesty, I believe that I have precisely the single issue that would do this.
Consider: working class wages have been static for two decades. Taxes have gone up, the cost of gasoline and rent has gone up, but there's been no corresponding increase in wages to offset this. The sense of endless treading water has fueled Trump's rise. Playing to this sense of "I can't win" seems to be the sweet spot for a Trump campaign.
The play is this: instead of income tax cuts (which disproportionately for to the upper 20%), revoke the Social Security worker-paid tax (FICA). This would be an immediate 7.25% increase in take home wages for 60% or more of the population. The likely cost would be $400M a year or so.
So where would Trump find that sort of coin? Adding it to the deficit is perhaps a winning play (c.f. Bernie Sanders), but is without doubt irresponsible. Having at least a deficit-neutral funding source would be preferable. So where do you find $400M of current government spending that Joe Everyman doesn't care about?
Certainly canceling most of these would cause a storm among the chattering classes. You'd hear nothing but how "Donald Trump is destroying the foundations of society" all day, every day until the election. It would be 24x7 anti-trump coverage about how he is undermining society. Every. Single. Day. For months.The federal government spends over $500 billion annually on grants-in-aid to state and local governments, making grants-in-aid the third largest item in the budget after Social Security and national defense. In recent decades, federal aid to state and local governments has soared and, thus, increased their reliance on federal aid for the financing of certain government functions.
And what's the counter-argument for Joe Everyman? How about "You'll take home $4,000 a year more than you do today." And the added argument of "So what current programs are worth $4,000 a year to your family?" will resonate. After all, the current spending is captured by special interests, none of which is interesting to Joe Everyman.
In an instant, Trump can refocus a significant percentage of government expenditures on a populist plan. That seems to be a winning play. Hillary is all about special interests, Trump would own the idea of reducing government burden on the working class.
And while this plan doesn't have the advantage of reducing overall expenditures, it does reduce the regressive nature of the tax structure. After all, the (Democratic party program of) Social Security is the single most regressive tax that the population struggles with. Trump would reduce (although not eliminate) that.
This seems like it would guarantee a massive working class turnout in the General election. Traditional Democratic party constituencies like blue collar and union blocs could break Trump's way. Hillary would have to spend more to try to keep these constituencies, and have to worry that her get out the vote efforts would just increase Trump's union vote. It might help Trump get more votes from the Black and Hispanic blocs - after all, it's a simple program with a lot of financial benefits directly to them.
Properly executed, this could lead to 40 or 45 States going to Trump. That level of support would intimidate Congress into enacting the needed statutes. They read the election returns, too.