Just received a Franklinia alatamaha and planting it today. But it's only supposed to be hardy to zone 6. So keep your fingers crossed for me.
Missouri Botanical Garden puts it a zone 5.
I'm rooting for you. I've noticed that recently the nursuries around here seem to be selling a number of 'hardy to Z6' plantings that can be babied to grow in Z5. I just bought a Lady In Red hydrangea that is Z6 but a 'maybe' for Z5. So far it looks like it is dying.
Next to go in...a Musa "Basjoo"...hehehe...I'm pushin' it now.:)