I actually think you are correct about them believing eschatology as tertiary. That is the way I think of it as well, except where an eschatological view changes the way one views soteriology.
I found out a while back, that there was a former pastor at our Church that was fired because he was A-mil.
Back then, the Church was very Dispensational and it did not sit well with many of the most influential members. Most of these members no longer attend, and the Church is now closer to its Reformed Baptist roots than ever before because of the influence of my pastor, who accepted the job with the idea of preaching the way he believed. My pastor actually is a Historic Premil; but I don't hold that against him. Lol
Tom