Trump is a Truman democrat in all ways but (maybe) one, that Truman was for single-payer health care.
Truman-democrat-ism is where America’s center is, and has been for the last generation at least. Bill Clinton, Bush 43, and Obama all got elected by convincing enough of the American public that they were Truman democrats. Trump, unlike the above triumvirate, is actually one.
Americans don’t want conservatives, and they don’t want liberals. They want their schools and hospitals to run, their roads to be paved and the bridges standing, their streets and homes safe, their borders secure, their stores stocked with necessary goods at reasonable prices, jobs to be available for those who can work, and welfare for those who can’t but not for those who won’t, and to be left alone to live their lives as they see fit when it doesn’t get in the way of anyone else. Democrats who convince enough voters that they can do all of the above get elected; Republicans who convince enough voters that they can do all of the above get elected. That the Democrats have to lie and the Republicans dissemble to do this, that only deepens the cynicism Americans have towards their government.
The progressives have the loudest voice, and the Republicrats the wringingest hands, but Trump not only says what the Americans want to hear, he is working to do it, and Americans are beginning to realize this in spite of the progressives’ voice and the Republicrats’ hand-wringing.
You have captured it nicely. Both parties, like all organisms, are self serving. Neither are willing to do those things and it may be its no longer to do those things across 50 states. What you have written here is a platform.
Trump will endorse a single-payer plan within six months.