I've been meaning to put my 2 cents in on this for a bit and always forget.
After years of roof top canoe/kayak transport we finally got ourselves a little utility trailer after we sold a S10 pickup.
Originally for hauling landscape finds we soon found it indispensable for camping and general hauling of stuff other than mulch and firewood. I'll never be without a utility trailer again.
So, one day, there we are loading the trailer up for a camping trip and I'm grunting the canoe up on top of the Suzuki XL7 (taller than the Pat.) and I think to myself, wonder if those pick up bed carriers would work in the trailer?
You know the ones tradesmen use to carry ladders and 2x material up on a rack over the bed?
So I made one out of 2x3 and 2x4 with 1/4" plywood gussets where additional stiffness/strength was needed. Got some old fire hose from the fire dept. and both made kayak slings and canoe "bumpers" out of that.
Its just a table frame without the table top, basically. bolts into the bed of the trailer and then you can bolt on either canoe specific or kayak specific top rack.
The joy of it is, once unbolted and placed in the storage area of the yard it gives you a spot to actually store the canoe off the ground and not tied up to rafters and etc.
Then you have the trailer back as a year round worker, not a parked, dedicated canoe trailer.
I sure don't miss the humping of boats to on top of the vehicle, can take all the ice and chairs and whatever we need on a camping trip and don't have to futz about with winching the boats up to the rafters or keep tripping over them under the deck.
I stopped using bolts some time ago and now use pins with clips that look like big safety pins. Faster and they don't rust shut like the bolts eventually do. Got them at a tractor supply, sorry I have no idea what they are called.