KD: Looks like the 14' is perfect size, really like the color too!
How much wind noise/strap movement do you get at highway speed w/canoe on top?
Do you have to reduce the highway speed while it's on to less than 90km?
On that trip, I used a couple of cam-buckle straps over the middle, and ratchet straps front and back... you really have to be careful with the ratchets or you could snap it in half pretty easy
It was pretty solid like this, not much movement at all and not much noise as I recall.
In the past I used a rope on the front going from one side of the bumper to canoe and back to the other side, and I'd probably do it like that in the future as it makes the front end less likely to move side-to-side.
I didn't feel a need to keep the speed down at all although I was towing a 20' trailer for much of the time so I don't go too crazy anyways, usually max 10 km/h over the limit.
The only funny thing with a vehicle like the Liberty, and it would be worse with a longer canoe, is that if you strap the back from the very back of the canoe, it actually pulls the canoe forward, loosening your front strap.
I got around this by putting the rear strap around the canoe seat, which is forward of the spare tire so pulls the canoe back, tightening the front strap.
To be honest, I probably could have got away without a rear strap at all but I'd rather have too many straps than not enough