Get you a jet ski trailer and carry them that way! I did that with my 08 Scion and would never do it any other way! Much easier than car topping especially with a Hobie PA or Hobie AI. If you have to, a lot of buddies I know used the bed extender from harbor freight to take their yaks...
2001 Jeep Wrangler Sahara Edition
4" Zone Suspension Lift Goodyear MTR 35s
Black Rock 909 D Rims
I6 4.0L 5 speed 3.73 gears
And more mods to come