Trump has not supported the Bushes since the Iraq war and many who knew Reagan, Trump and his father did know Reagan, were wary of the Bushes. It is well known that the Reagans never liked the Bushes.
http://www.newsweek.com/reagan-and-bush-call-it-snub-196034
“Ronald Reagan is not called the Great Communicator for nothing. In one brief sentence last week, the ex-president neatly summed up his view of George Bush: “He doesn’t seem to stand for anything,” Reagan reportedly told friends. The former president later denied ever making the remark, first published in The Washington Post, but in case anyone doubted his true feelings Reagan then refused to be seen with the president in public. He skipped a Bush fund-raiser in Los Angeles and barred the press from his house when Bush came calling.”...
“There has never been much love lost between the Bushes and the Reagans. The relationship between the ex-president and his former veep was always a marriage of convenience. After eight years of service so loyal that Bush was derided as a lap dog, Reagan only tepidly and belatedly endorsed his number two for president in 1988 and once mispronounced his name (”George Bosh”). Bush was more than happy to use the “Reagan-Bush” legacy to get elected, but he had little respect for the former president’s hands-off management style—or for Reagan’s hard line against the Kremlin.”
Reagan believed in Peace through Strength...that is Trump’s policy as well. The Bushes have never been the kind of politicians to capture the imagination or inspiration of the masses. The Bushes have had to use wars and warmongering to get conservatives to rally round the flag during all Bush administrations.
Best post in this entire thread,Thank you.