Trump in the White House would face an uphill battle with House republicans (the establishment).
I disagree and the only way we're ever going to find out is if Trump wins. I think Trump would be more open to working with both sides to get effective legislation passed than some of the other candidates. It's not going to be about who gets along with the establishment.
There is going to eventually be a "come to jesus moment" for those who currently hold political office in Congress. They are going to accept the realization that America has spoken and if they have any political ambition to remain in their respective seats, they better listen. Now, there will be some who don't really care because they plan to retire and there will be hardcore ideologues who defiantly represent their radical constituents, but by-and-large, the rank and file politicians are going to respect that Trump won the election and "elections have consequences" comes into play. You're not seeing that now because this is the primary race... this is where they hope to take Trump out. IF HE WINS... it's a completely different game.