There's one very good reason there ISN'T a pretribulational rapture: the Bible NEVER says such a thing.
If Jesus comes down from heaven with all the dead saints and meets all the living saints, and resurrects all the dead ones and "changes" all the living one, and then goes back to heaven, why doesn't Scripture ever say that?
There is no such "U-turn" in the Bible; Jesus returning to heaven with all believers.
In fact, 2 Thess 2:1-3 clearly states the order of the Second Coming and the "gathering", better known as the rapture. The Second Coming precedes the "gathering".
1 Concerning
the coming of our Lord Jesus Christ and our being gathered to him, we ask you, brothers and sisters,
2 not to become easily unsettled or alarmed by the teaching allegedly from us—whether by a prophecy or by word of mouth or by letter—asserting that the day of the Lord has already come.
3 Don’t let anyone deceive you in any way, for
that day will not come until the rebellion occurs and the man of lawlessness is revealed, the man doomed to destruction.
Finally, the pre-tribbers must deal with what the Bible terms "the FIRST resurrection", which occurs when Jesus returns at the Second Advent and resurrects the tribulation martyrs.
Rev 20-
4 I saw thrones on which were seated those who had been given authority to judge.
And I saw the souls of those who had been beheaded because of their testimony about Jesus and because of the word of God. They had not worshiped the beast or its image and had not received its mark on their foreheads or their hands. They came to life and reigned with Christ a thousand years.
5 (The rest of the dead did not come to life until the thousand years were ended.)
This is the first resurrection.
There can't be a PRE-first resurrection, 7years prior. That doesn't make sense.
1 Cor 15:23 - But
each in turn: Christ, the firstfruits; then, when he comes, those who belong to him.
Here, we have 2 groups, from the phrase "each in turn". The first "group" is Christ, described as "the firstfruits". What then follows is real clear; "when He comes", "those who belong to Him".
If the resurrection/rapture is pre-trib, the tribulation martyrs can't be included in "the first resurretion", because that would be 7 years before Christ comes at the Second Advent.