Salvation is 'spiritual'. It is about being spiritually alive and not spiritually dead. Its "central and main benefit" is being with God forever instead of being tormented in a lake of fire.
Nowhere in the Bible are Christians promised 'escape' from 'tribulation' - 'escape' from the 'Wrath of God' - yes - 'escape' from 'tribulation' - no.
The verses you listed say
nothing about the rapture
with reference to 'tribulation'; however, they
do speak of it
with reference to the 'trump of God' and place it as being 'pre-wrath'. And, since the 'trump of God' is associated with the
last of the Seven Trumpets in 1 Corinthians 15:52 - the rapture is therefore aligned with the 'last trump'. And, since the 'Trumpet' events are 'post-trib' by association in the descriptions of multiple verses/passages of scripture - the rapture is 'post-trib'.
The 'Trumpet' events are 'post-trib' and 'pre-wrath' without overlap.
The 'Resurrection & Rapture' takes place at/after the 'last trump' and before the 'Wrath of God'.
The 'Great Tribulation' (as we call it)
ends right before the 'Trumpet' events begin to unfold - caused by the
Two Witnesses by their prophecy/testimony.
Please see:
http://mywebsite.us/BibleStudy/Order_Of_Events.html
Nowhere in the Bible is the rapture actually described/indicated/stated to be
before 'tribulation'.