Virtually the same as the F150. I like the setup because we cannot see the canoe when we are on the road.
I've dealt with headache racks before and I think that this a a pretty cool alternative.
Two different brands of racks, two different applications, many measurements, some holes drilled in brand new truck and quite a few cuts later - I got this []
The canoe is 14 feet long.

 

Looks good. My wife is 7 months pregnant, so we haven't been able to do too much since it warmed up but we are hoping to get back out on the water soon