Without our camp trailer we use a Yakima Rack and Roll 78" trailer for our yaks and mountain bikes....we have 14' long Old Town kayaks. You can also mount a rooftop box on the trailer to haul other stuff (like paddles and gear) but the trailer only holds about 300 pounds total. It weighs like nothing. We have the Thule J racks that fit on all of this stuff.
With our camp trailer on we have 2 4' step ladders to get the kayaks on top of our Tundra with cap using "cap racks".
Our previous truck has no cap and we used a Thule Exporter to carry the yaks (and lumber). Nice set up.