I got Karrite roof racks for my 18' canoe.  The rack I got was made mainly
for painters; it came with a ladder bracket, which I didn't use.  It
attaches to the rain gutter so you don't have to worry about drilling
through your pop-top.  The down side is that when you raise the top the
rear rack has to be removed and the front rack must be moved forward.  The
front rack can't be attached in front of the pop-top because the end plate
will tear up the door seals (i found this out the hard way).  I drilled
holes higher up on the side bracket to raise the tube above the top.

The Karrite is no longer made but this one looks identical:

http://www.rackattack.com/product-pages/product-pdf/dewalt-contractor-steel-2-bar-van-rack-system-instructions.pdf

They cost about $175.

On Wed, Dec 19, 2012 at 6:29 PM, Harry Hoffman <hhoffman@ip-solutions.net>wrote:

> forwarding to the list as I thought I hit reply-all but it seems I didn't.
>
>
> -------- Original Message --------
> Subject: Re: Roof top Racks
> Date: Wed, 19 Dec 2012 18:15:03 -0500
> From: Harry Hoffman <hhoffman@ip-solutions.net>
> To: paul gordon <paul_gordon@SYMPATICO.CA>
>
> If you are going to go with Thule kit you'll need to install a set of
> fake gutters on the pop top for the feet to hold onto.
> The feet you want are the 387, not the 300. They are the longer feet,
> you need them to clear the pop top.
> Yakima has a similar kit but I don't know the specifics.
> Check craigslist/eBay! You can get the whole thing for around $140 (top
> end).
> 72" bars are the way to go but they are hard to find. I think 48" is the
> bare minimum but I can double check if you need.
>
> Cheers,
> Harry
>