Ironically Trump might be in a uniquely good position to propose singlepayer, better than any Liberal at least. Most of Reform is probably behind him due to Reform practically just being Trump by this point, and most Democrats will support him for this. If he can get it past the Senate, we could see some version of healthreform under Trump, even if it's a lot like OTL's Obamacare. Screw calling it the Affordable Care Act, too, why not call it the name it deserves: Trumpcare!
Meanwhile, we could see some tax cuts, tougher stances against illegal immigrants (while perhaps being better for some immigrants), the possible repeal of NAFTA and other attempts at trade protectionism, and even some infrastructure projects. One issue will show Democrats backing Trump to the hilt, the next Republicans, and I expect Reform to essentially be a party of yes-men for him in D.C.