[MNCarl]

Are thinking you may have problems loading the Kayak solo?
I have never owned a kayak so this thinking may be way off...and apologies in advance if this is stating the obvious.
Drop the tailgate , close the topper/camper shell door , stand on the tail gate grab the kayak and put it on your load bars.
Then place your feet on top of your rear tire and stand up to reach on top of your cap/topper/camper shell and secure the kayak.

 

[MNCarl]

Check out this clubfrontier member, Post #102 , Qty Two kayaks and a cargo basket:
Click on the link...post #102
http://www.clubfrontier.org/forums/f10/post-your-truck-cap-pics-here-737/index11.html

 

[MNCarl]

I would just do some reading/research/googling...
Check out other websites like Expedition Portal and sometimes I go to the enemy website for ideas www.tacomaworld.com or even TheXterra.org

Google things like:
kayak on camper shell tacomaworld
camping in topper cap clubfrontier
fishing rod storage expeditionportal