Tom,
I was thinking about the loader you made and was thinking with a little tinkering it could be used to kill two birds with one stone...
I borrowed a thing called an [font=Verdana,Arial,Helvetica,sans sarif][font=Verdana,Arial,Helvetica,sans sarif][font=Verdana,Arial,Helvetica,sans sarif][font=Verdana,Arial,Helvetica,sans sarif][font=Verdana,Arial,Helvetica,sans sarif]extend-a-truck from a co-worker once that was used to carry long stuff in the bed if the truck. It was a two part deal - a T shaped part and an L shaped part with one long "leg" and one short "leg". Thinking about it just now, I realize that the L was just like your loader/lift assist!!!!
The [/font][/font][/font][/font][/font][font=Verdana,Arial,Helvetica,sans sarif][font=Verdana,Arial,Helvetica,sans sarif][font=Verdana,Arial,Helvetica,sans sarif][font=Verdana,Arial,Helvetica,sans sarif][font=Verdana,Arial,Helvetica,sans sarif]Extend-a-Truck thing was usable in two ways, flipped so the long arm of the L was in the trailer hitch and the T was on the short leg, it could be used to carry very long materials (what I used it for - carrying 16' 5/4 trim pieces), but if you flipped the L so the short leg was in the trailer hitch and the long arm was vertical, you could support materials cab high (like on top of your truck cap).
This thing would not usable like your loader bacause the T was fixed and could not rotate (it was a square tube, not a round tube). however, if you combined the two....
I think if you drilled a set of holes (to fit the hitch pin) in the long leg of your L piece, you could use yours the same way (so the long arm could be horizontal and the short leg vertical). Sort of an extra feature for only the extra effort of drilling two holes. A canoe loader AND a bed extender all in one!!!!
So now you're going to tell me you already did that and am stating the obvious, right...
Charlie
[/font][/font][/font][/font][/font]