How do you transport a canoe that's 42 inches wide when you have a 41 inch space in between factory rails? Foam blocks wouldn't work, would they? 

You can use cross pieces as wide as needed with a setup like this

7 minutes ago, Scott F said:

You can use cross pieces as wide as needed with a setup like this

Do you know what specific model that is? Thanks

7 minutes ago, trick worms said:

Do you know what specific model that is? Thanks

I have no idea. I just Googled canoe carrier. I looked it up again. Here is the link from Amazon.

https://www.amazon.com/Malone-Auto-Racks-Universal-50-Inch/dp/B002VG2JDM/ref=lp_491441011_1_14/184-6206117-3172235?s=outdoor-recreation&ie=UTF8&qid=1466473051&sr=1-14

Just get a rack system and wider bars, problem solved.

8 minutes ago, Scott F said:

I have no idea. I just Googled canoe carrier. I looked it up again. Here is the link from Amazon.

https://www.amazon.com/Malone-Auto-Racks-Universal-50-Inch/dp/B002VG2JDM/ref=lp_491441011_1_14/184-6206117-3172235?s=outdoor-recreation&ie=UTF8&qid=1466473051&sr=1-14

Thanks, what else would you need, a strap system or something like that?

Here ya go.

http://lmgtfy.com/?q=Canoe+roof+racks

26 minutes ago, Philo Beddoe said:

Here ya go.

http://lmgtfy.com/?q=Canoe+roof+racks

Thanks. Will a system like the Malone big foot pro be able to extend far enough out to fit the canoe I might get that's 42 inches wide? My concern is the distance between the cars factory rails is 41 inches. Thanks and sorry if these are stupid questions 

I had factory rails and crossbars on my Subaru Outback. The rails and bars were not wide enough for the canoe (by about 4") so I solved this by using two pine boards (1/2" x  2"  x  5') and pushed them up against the crossbars.  When I strapped down the canoe, its weight kept the boards in place but I decided to duct tape them to the cross bars for additional security. 

With this setup I took the canoe on a number of 200+ round trip mile drives to the Adirondacks and hit speeds of well over 70 mph on the highways.  And the entire cost was about $6 for the wood duct tape.  When I got home I just sliced the tape off and removed the boards.