The best dunes are probably in Glamis...
However, that's California. I simply can't imagine the drive there from Michigan, let alone Nova Scotia? Yikes.
Maybe some of the southern boys can help out here...
Anything in KS, Missouri...or other states that has dunes open in Feb. Silver Lake in MI is a blast, but...you'd probably need snow tires for those babies in Feb., if they were even open.
Chase...is there dunes in/near Florida for our neighbors to the north?
Honestly Swag, you're talking southern US for any decent riding in Feb...
And, you're shees will be just fine for dunes. Depending on where you go, you'll see bone stockers with knobby tires on 'em, all the way to 100 +HP fire breathing monsters all stretched out running exotic fuels...and everything in between.
If you have the means to ship the quads and fly yourself, Glamis is the once in a lifetime trip for most. however...I can't see you spending a few weeks JUST DRIVING there and back...