This has worked for me on the few occasions I need to carry two canoes. If you are not confident in your knot tying skills this might not be the best solution. I had the pipes from the setup on my trailer so my only expense was a foot of vinyl tubing and two yoga blocks about $15. The blocks are cut to fit and engage the contours of the side rails. The vinyl was used to pad the metal tie down points. The padding is short nap industrial carpet wrapped in duct tape.
View attachment 147236
View attachment 147237
View attachment 147238
View attachment 147239
View attachment 147240
Canoes were tied to the bars and at the bow and stern additional straps were holding thing to the factory Subaru bars.
The foam blocks actually interlock in the side rails so they do not have the ability move fore and aft. If anyone wants to see the bottom of the block shapes I can take a pic as the bars are not installed yet. They will be next week getting ready to go to the assembly.
Jim
Here it is loaded for last year.
View attachment 147241